mirror of
https://github.com/MariaDB/server.git
synced 2025-11-03 14:33:32 +03:00
1412 lines
52 KiB
Plaintext
1412 lines
52 KiB
Plaintext
drop table if exists t1,t2,t3,t4,t5,t6,t7,t8,t11,t12;
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select (select 2);
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(select 2)
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2
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explain select (select 2);
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id select_type table type possible_keys key key_len ref rows Extra
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1 PRIMARY NULL NULL NULL NULL NULL NULL NULL No tables used
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Warnings:
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Note 1248 Select 2 was reduced during optimisation
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SELECT (SELECT 1) UNION SELECT (SELECT 2);
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(SELECT 1)
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1
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2
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explain SELECT (SELECT 1) UNION SELECT (SELECT 2);
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id select_type table type possible_keys key key_len ref rows Extra
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1 PRIMARY NULL NULL NULL NULL NULL NULL NULL No tables used
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3 UNION NULL NULL NULL NULL NULL NULL NULL No tables used
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Warnings:
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Note 1248 Select 2 was reduced during optimisation
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Note 1248 Select 4 was reduced during optimisation
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SELECT (SELECT (SELECT 0 UNION SELECT 0));
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(SELECT (SELECT 0 UNION SELECT 0))
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0
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explain SELECT (SELECT (SELECT 0 UNION SELECT 0));
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id select_type table type possible_keys key key_len ref rows Extra
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1 PRIMARY NULL NULL NULL NULL NULL NULL NULL No tables used
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3 SUBQUERY NULL NULL NULL NULL NULL NULL NULL No tables used
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4 UNION NULL NULL NULL NULL NULL NULL NULL No tables used
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Warnings:
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Note 1248 Select 2 was reduced during optimisation
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SELECT (SELECT 1 FROM (SELECT 1) as b HAVING a=1) as a;
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ERROR 42S22: Reference 'a' not supported (forward reference in item list)
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SELECT (SELECT 1 FROM (SELECT 1) as b HAVING b=1) as a,(SELECT 1 FROM (SELECT 1) as c HAVING a=1) as b;
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ERROR 42S22: Reference 'b' not supported (forward reference in item list)
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SELECT (SELECT 1),MAX(1) FROM (SELECT 1) as a;
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(SELECT 1) MAX(1)
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1 1
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SELECT (SELECT a) as a;
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ERROR 42S22: Reference 'a' not supported (forward reference in item list)
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EXPLAIN SELECT 1 FROM (SELECT 1 as a) as b HAVING (SELECT a)=1;
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id select_type table type possible_keys key key_len ref rows Extra
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1 PRIMARY <derived2> system NULL NULL NULL NULL 1
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3 DEPENDENT SUBQUERY NULL NULL NULL NULL NULL NULL NULL No tables used
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2 DERIVED NULL NULL NULL NULL NULL NULL NULL No tables used
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Warnings:
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Note 1275 Field or reference 'a' of SELECT #3 was resolved in SELECT #1
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Note 1275 Field or reference 'b.a' of SELECT #3 was resolved in SELECT #1
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SELECT 1 FROM (SELECT 1 as a) as b HAVING (SELECT a)=1;
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1
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1
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SELECT (SELECT 1), a;
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ERROR 42S22: Unknown column 'a' in 'checking transformed subquery'
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SELECT 1 as a FROM (SELECT 1) as b HAVING (SELECT a)=1;
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a
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1
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SELECT 1 FROM (SELECT (SELECT a) b) c;
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ERROR 42S22: Unknown column 'a' in 'field list'
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SELECT * FROM (SELECT 1 as id) b WHERE id IN (SELECT * FROM (SELECT 1 as id) c ORDER BY id);
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id
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1
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SELECT * FROM (SELECT 1) a WHERE 1 IN (SELECT 1,1);
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ERROR 21000: Cardinality error (more/less than 1 columns)
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SELECT 1 IN (SELECT 1);
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1 IN (SELECT 1)
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1
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SELECT 1 FROM (SELECT 1 as a) b WHERE 1 IN (SELECT (SELECT a));
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1
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1
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select (SELECT 1 FROM (SELECT 1) a PROCEDURE ANALYSE(1));
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ERROR HY000: Wrong usage of PROCEDURE and subquery
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SELECT 1 FROM (SELECT 1) a PROCEDURE ANALYSE((SELECT 1));
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ERROR HY000: Incorrect parameters to procedure 'ANALYSE'
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SELECT (SELECT 1) as a FROM (SELECT 1) b WHERE (SELECT a) IS NULL;
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a
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SELECT (SELECT 1) as a FROM (SELECT 1) b WHERE (SELECT a) IS NOT NULL;
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a
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1
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SELECT (SELECT 1,2,3) = ROW(1,2,3);
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(SELECT 1,2,3) = ROW(1,2,3)
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1
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SELECT (SELECT 1,2,3) = ROW(1,2,1);
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(SELECT 1,2,3) = ROW(1,2,1)
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0
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SELECT (SELECT 1,2,3) < ROW(1,2,1);
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(SELECT 1,2,3) < ROW(1,2,1)
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0
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SELECT (SELECT 1,2,3) > ROW(1,2,1);
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(SELECT 1,2,3) > ROW(1,2,1)
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1
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SELECT (SELECT 1,2,3) = ROW(1,2,NULL);
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(SELECT 1,2,3) = ROW(1,2,NULL)
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NULL
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SELECT ROW(1,2,3) = (SELECT 1,2,3);
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ROW(1,2,3) = (SELECT 1,2,3)
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1
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SELECT ROW(1,2,3) = (SELECT 1,2,1);
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ROW(1,2,3) = (SELECT 1,2,1)
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0
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SELECT ROW(1,2,3) < (SELECT 1,2,1);
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ROW(1,2,3) < (SELECT 1,2,1)
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0
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SELECT ROW(1,2,3) > (SELECT 1,2,1);
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ROW(1,2,3) > (SELECT 1,2,1)
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1
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SELECT ROW(1,2,3) = (SELECT 1,2,NULL);
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ROW(1,2,3) = (SELECT 1,2,NULL)
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NULL
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SELECT (SELECT 1.5,2,'a') = ROW(1.5,2,'a');
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(SELECT 1.5,2,'a') = ROW(1.5,2,'a')
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1
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SELECT (SELECT 1.5,2,'a') = ROW(1.5,2,'b');
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(SELECT 1.5,2,'a') = ROW(1.5,2,'b')
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0
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SELECT (SELECT 1.5,2,'a') = ROW('b',2,'b');
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(SELECT 1.5,2,'a') = ROW('b',2,'b')
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0
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SELECT (SELECT 'b',2,'a') = ROW(1.5,2,'a');
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(SELECT 'b',2,'a') = ROW(1.5,2,'a')
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0
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SELECT (SELECT 1.5,2,'a') = ROW(1.5,'c','a');
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(SELECT 1.5,2,'a') = ROW(1.5,'c','a')
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0
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SELECT (SELECT 1.5,'c','a') = ROW(1.5,2,'a');
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(SELECT 1.5,'c','a') = ROW(1.5,2,'a')
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0
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SELECT (SELECT * FROM (SELECT 'test' a,'test' b) a);
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ERROR 21000: Cardinality error (more/less than 1 columns)
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SELECT 1 as a,(SELECT a+a) b,(SELECT b);
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a b (SELECT b)
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1 2 2
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create table t1 (a int);
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create table t2 (a int, b int);
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create table t3 (a int);
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create table t4 (a int not null, b int not null);
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insert into t1 values (2);
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insert into t2 values (1,7),(2,7);
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insert into t4 values (4,8),(3,8),(5,9);
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select (select a from t1 where t1.a = a1) as a2, (select b from t2 where t2.b=a2) as a1;
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ERROR 42S22: Reference 'a1' not supported (forward reference in item list)
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select (select a from t1 where t1.a=t2.a), a from t2;
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(select a from t1 where t1.a=t2.a) a
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NULL 1
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2 2
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select (select a from t1 where t1.a=t2.b), a from t2;
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(select a from t1 where t1.a=t2.b) a
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NULL 1
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NULL 2
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select (select a from t1), a from t2;
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(select a from t1) a
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2 1
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2 2
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select (select a from t3), a from t2;
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(select a from t3) a
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NULL 1
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NULL 2
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select * from t2 where t2.a=(select a from t1);
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a b
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2 7
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insert into t3 values (6),(7),(3);
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select * from t2 where t2.b=(select a from t3 order by 1 desc limit 1);
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a b
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1 7
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2 7
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(select * from t2 where t2.b=(select a from t3 order by 1 desc limit 1)) union (select * from t4 order by a limit 2) limit 3;
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a b
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1 7
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2 7
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3 8
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(select * from t2 where t2.b=(select a from t3 order by 1 desc limit 1)) union (select * from t4 where t4.b=(select max(t2.a)*4 from t2) order by a);
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a b
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1 7
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2 7
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3 8
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4 8
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explain (select * from t2 where t2.b=(select a from t3 order by 1 desc limit 1)) union (select * from t4 where t4.b=(select max(t2.a)*4 from t2) order by a);
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id select_type table type possible_keys key key_len ref rows Extra
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1 PRIMARY t2 ALL NULL NULL NULL NULL 2 Using where
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2 SUBQUERY t3 ALL NULL NULL NULL NULL 3 Using filesort
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3 UNION t4 ALL NULL NULL NULL NULL 3 Using where; Using filesort
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4 SUBQUERY t2 ALL NULL NULL NULL NULL 2
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select (select a from t3 where a<t2.a*4 order by 1 desc limit 1), a from t2;
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(select a from t3 where a<t2.a*4 order by 1 desc limit 1) a
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3 1
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7 2
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select (select t3.a from t3 where a<8 order by 1 desc limit 1), a from
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(select * from t2 where a>1) as tt;
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(select t3.a from t3 where a<8 order by 1 desc limit 1) a
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7 2
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explain select (select t3.a from t3 where a<8 order by 1 desc limit 1), a from
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(select * from t2 where a>1) as tt;
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id select_type table type possible_keys key key_len ref rows Extra
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1 PRIMARY <derived3> system NULL NULL NULL NULL 1
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3 DERIVED t2 ALL NULL NULL NULL NULL 2 Using where
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2 SUBQUERY t3 ALL NULL NULL NULL NULL 3 Using where; Using filesort
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select * from t1 where t1.a=(select t2.a from t2 where t2.b=(select max(a) from t3) order by 1 desc limit 1);
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a
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2
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select * from t1 where t1.a=(select t2.a from t2 where t2.b=(select max(a) from t3 where t3.a > t1.a) order by 1 desc limit 1);
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a
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2
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select * from t1 where t1.a=(select t2.a from t2 where t2.b=(select max(a) from t3 where t3.a < t1.a) order by 1 desc limit 1);
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a
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select b,(select avg(t2.a+(select min(t3.a) from t3 where t3.a >= t4.a)) from t2) from t4;
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b (select avg(t2.a+(select min(t3.a) from t3 where t3.a >= t4.a)) from t2)
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8 7.5000
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8 4.5000
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9 7.5000
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explain select b,(select avg(t2.a+(select min(t3.a) from t3 where t3.a >= t4.a)) from t2) from t4;
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id select_type table type possible_keys key key_len ref rows Extra
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1 PRIMARY t4 ALL NULL NULL NULL NULL 3
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2 DEPENDENT SUBQUERY t2 ALL NULL NULL NULL NULL 2
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3 DEPENDENT SUBQUERY t3 ALL NULL NULL NULL NULL 3 Using where
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Warnings:
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Note 1275 Field or reference 't4.a' of SELECT #3 was resolved in SELECT #1
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select * from t3 where exists (select * from t2 where t2.b=t3.a);
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a
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7
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select * from t3 where not exists (select * from t2 where t2.b=t3.a);
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a
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6
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3
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select * from t3 where a in (select b from t2);
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a
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7
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select * from t3 where a not in (select b from t2);
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a
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6
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3
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select * from t3 where a = some (select b from t2);
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a
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7
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select * from t3 where a <> any (select b from t2);
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a
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6
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3
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select * from t3 where a = all (select b from t2);
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a
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7
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select * from t3 where a <> all (select b from t2);
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a
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6
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3
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insert into t2 values (100, 5);
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select * from t3 where a < any (select b from t2);
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a
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6
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3
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select * from t3 where a < all (select b from t2);
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a
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3
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select * from t3 where a >= any (select b from t2);
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a
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6
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7
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select * from t3 where a >= all (select b from t2);
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a
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7
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delete from t2 where a=100;
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select * from t3 where a in (select a,b from t2);
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ERROR 21000: Cardinality error (more/less than 1 columns)
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select * from t3 where a in (select * from t2);
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ERROR 21000: Cardinality error (more/less than 1 columns)
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insert into t4 values (12,7),(1,7),(10,9),(9,6),(7,6),(3,9),(1,10);
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select b,max(a) as ma from t4 group by b having b < (select max(t2.a) from t2 where t2.b=t4.b);
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b ma
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insert into t2 values (2,10);
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select b,max(a) as ma from t4 group by b having ma < (select max(t2.a) from t2 where t2.b=t4.b);
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b ma
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10 1
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delete from t2 where a=2 and b=10;
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select b,max(a) as ma from t4 group by b having b >= (select max(t2.a) from t2 where t2.b=t4.b);
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b ma
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7 12
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create table t5 (a int);
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select (select a from t1 where t1.a=t2.a union select a from t5 where t5.a=t2.a), a from t2;
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(select a from t1 where t1.a=t2.a union select a from t5 where t5.a=t2.a) a
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NULL 1
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2 2
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insert into t5 values (5);
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select (select a from t1 where t1.a=t2.a union select a from t5 where t5.a=t2.a), a from t2;
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(select a from t1 where t1.a=t2.a union select a from t5 where t5.a=t2.a) a
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NULL 1
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2 2
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insert into t5 values (2);
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select (select a from t1 where t1.a=t2.a union select a from t5 where t5.a=t2.a), a from t2;
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(select a from t1 where t1.a=t2.a union select a from t5 where t5.a=t2.a) a
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NULL 1
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2 2
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explain select (select a from t1 where t1.a=t2.a union select a from t5 where t5.a=t2.a), a from t2;
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id select_type table type possible_keys key key_len ref rows Extra
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1 PRIMARY t2 ALL NULL NULL NULL NULL 2
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2 DEPENDENT SUBQUERY t1 system NULL NULL NULL NULL 1
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3 DEPENDENT UNION t5 ALL NULL NULL NULL NULL 2 Using where
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Warnings:
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Note 1275 Field or reference 't2.a' of SELECT #2 was resolved in SELECT #1
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Note 1275 Field or reference 't2.a' of SELECT #3 was resolved in SELECT #1
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select (select a from t1 where t1.a=t2.a union all select a from t5 where t5.a=t2.a), a from t2;
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ERROR 21000: Subselect returns more than 1 record
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create table t6 (patient_uq int, clinic_uq int, index i1 (clinic_uq));
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create table t7( uq int primary key, name char(25));
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insert into t7 values(1,"Oblastnaia bolnitsa"),(2,"Bolnitsa Krasnogo Kresta");
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insert into t6 values (1,1),(1,2),(2,2),(1,3);
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select * from t6 where exists (select * from t7 where uq = clinic_uq);
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patient_uq clinic_uq
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1 1
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1 2
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2 2
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explain select * from t6 where exists (select * from t7 where uq = clinic_uq);
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id select_type table type possible_keys key key_len ref rows Extra
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1 PRIMARY t6 ALL NULL NULL NULL NULL 4 Using where
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2 DEPENDENT SUBQUERY t7 eq_ref PRIMARY PRIMARY 4 test.t6.clinic_uq 1
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Warnings:
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Note 1275 Field or reference 'clinic_uq' of SELECT #2 was resolved in SELECT #1
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select * from t1 where a= (select a from t2,t4 where t2.b=t4.b);
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ERROR 23000: Column: 'a' in field list is ambiguous
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drop table if exists t1,t2,t3;
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CREATE TABLE t3 (a varchar(20),b char(1) NOT NULL default '0');
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INSERT INTO t3 VALUES ('W','a'),('A','c'),('J','b');
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CREATE TABLE t2 (a varchar(20),b int NOT NULL default '0');
|
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INSERT INTO t2 VALUES ('W','1'),('A','3'),('J','2');
|
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CREATE TABLE t1 (a varchar(20),b date NOT NULL default '0000-00-00');
|
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INSERT INTO t1 VALUES ('W','1732-02-22'),('A','1735-10-30'),('J','1743-04-13');
|
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SELECT * FROM t1 WHERE b = (SELECT MIN(b) FROM t1);
|
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a b
|
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W 1732-02-22
|
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SELECT * FROM t2 WHERE b = (SELECT MIN(b) FROM t2);
|
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a b
|
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W 1
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SELECT * FROM t3 WHERE b = (SELECT MIN(b) FROM t3);
|
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a b
|
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W a
|
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CREATE TABLE `t8` (
|
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`pseudo` varchar(35) character set latin1 NOT NULL default '',
|
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`email` varchar(60) character set latin1 NOT NULL default '',
|
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PRIMARY KEY (`pseudo`),
|
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UNIQUE KEY `email` (`email`)
|
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) TYPE=MyISAM CHARSET=latin1 ROW_FORMAT=DYNAMIC;
|
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INSERT INTO t8 (pseudo,email) VALUES ('joce','test');
|
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INSERT INTO t8 (pseudo,email) VALUES ('joce1','test1');
|
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INSERT INTO t8 (pseudo,email) VALUES ('2joce1','2test1');
|
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EXPLAIN SELECT pseudo,(SELECT email FROM t8 WHERE pseudo=(SELECT pseudo FROM t8 WHERE pseudo='joce')) FROM t8 WHERE pseudo=(SELECT pseudo FROM t8 WHERE pseudo='joce');
|
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id select_type table type possible_keys key key_len ref rows Extra
|
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1 PRIMARY t8 const PRIMARY PRIMARY 35 const 1
|
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4 SUBQUERY t8 const PRIMARY PRIMARY 35 1
|
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2 SUBQUERY t8 const PRIMARY PRIMARY 35 const 1
|
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3 SUBQUERY t8 const PRIMARY PRIMARY 35 1
|
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SELECT pseudo FROM t8 WHERE pseudo=(SELECT pseudo,email FROM
|
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t8 WHERE pseudo='joce');
|
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ERROR 21000: Cardinality error (more/less than 1 columns)
|
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SELECT pseudo FROM t8 WHERE pseudo=(SELECT * FROM t8 WHERE
|
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pseudo='joce');
|
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ERROR 21000: Cardinality error (more/less than 1 columns)
|
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SELECT pseudo FROM t8 WHERE pseudo=(SELECT pseudo FROM t8 WHERE pseudo='joce');
|
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pseudo
|
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joce
|
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SELECT pseudo FROM t8 WHERE pseudo=(SELECT pseudo FROM t8 WHERE pseudo LIKE '%joce%');
|
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ERROR 21000: Subselect returns more than 1 record
|
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drop table if exists t1,t2,t3,t4,t5,t6,t7,t8;
|
||
CREATE TABLE `t1` (
|
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`topic` mediumint(8) unsigned NOT NULL default '0',
|
||
`date` date NOT NULL default '0000-00-00',
|
||
`pseudo` varchar(35) character set latin1 NOT NULL default '',
|
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PRIMARY KEY (`pseudo`,`date`,`topic`),
|
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KEY `topic` (`topic`)
|
||
) TYPE=MyISAM ROW_FORMAT=DYNAMIC;
|
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INSERT INTO t1 (topic,date,pseudo) VALUES
|
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('43506','2002-10-02','joce'),('40143','2002-08-03','joce');
|
||
EXPLAIN SELECT DISTINCT date FROM t1 WHERE date='2002-08-03';
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 SIMPLE t1 index NULL PRIMARY 41 NULL 2 Using where; Using index
|
||
EXPLAIN SELECT (SELECT DISTINCT date FROM t1 WHERE date='2002-08-03');
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 PRIMARY NULL NULL NULL NULL NULL NULL NULL No tables used
|
||
2 SUBQUERY t1 index NULL PRIMARY 41 NULL 2 Using where; Using index
|
||
SELECT DISTINCT date FROM t1 WHERE date='2002-08-03';
|
||
date
|
||
2002-08-03
|
||
SELECT (SELECT DISTINCT date FROM t1 WHERE date='2002-08-03');
|
||
(SELECT DISTINCT date FROM t1 WHERE date='2002-08-03')
|
||
2002-08-03
|
||
SELECT 1 FROM t1 WHERE 1=(SELECT 1 UNION SELECT 1) UNION ALL SELECT 1;
|
||
1
|
||
1
|
||
1
|
||
1
|
||
SELECT 1 FROM t1 WHERE 1=(SELECT 1 UNION ALL SELECT 1) UNION SELECT 1;
|
||
ERROR 21000: Subselect returns more than 1 record
|
||
EXPLAIN SELECT 1 FROM t1 WHERE 1=(SELECT 1 UNION SELECT 1);
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 PRIMARY t1 index NULL topic 3 NULL 2 Using index
|
||
2 SUBQUERY NULL NULL NULL NULL NULL NULL NULL No tables used
|
||
3 UNION NULL NULL NULL NULL NULL NULL NULL No tables used
|
||
drop table t1;
|
||
CREATE TABLE `t1` (
|
||
`numeropost` mediumint(8) unsigned NOT NULL auto_increment,
|
||
`maxnumrep` int(10) unsigned NOT NULL default '0',
|
||
PRIMARY KEY (`numeropost`),
|
||
UNIQUE KEY `maxnumrep` (`maxnumrep`)
|
||
) TYPE=MyISAM ROW_FORMAT=FIXED;
|
||
INSERT INTO t1 (numeropost,maxnumrep) VALUES (40143,1),(43506,2);
|
||
CREATE TABLE `t2` (
|
||
`mot` varchar(30) NOT NULL default '',
|
||
`topic` mediumint(8) unsigned NOT NULL default '0',
|
||
`date` date NOT NULL default '0000-00-00',
|
||
`pseudo` varchar(35) NOT NULL default '',
|
||
PRIMARY KEY (`mot`,`pseudo`,`date`,`topic`)
|
||
) TYPE=MyISAM ROW_FORMAT=DYNAMIC;
|
||
INSERT INTO t2 (mot,topic,date,pseudo) VALUES ('joce','40143','2002-10-22','joce'), ('joce','43506','2002-10-22','joce');
|
||
select numeropost as a FROM t1 GROUP BY (SELECT 1 FROM t1 HAVING a=1);
|
||
a
|
||
40143
|
||
SELECT numeropost,maxnumrep FROM t1 WHERE exists (SELECT 1 FROM t2 WHERE (mot='joce') AND date >= '2002-10-21' AND t1.numeropost = t2.topic) ORDER BY maxnumrep DESC LIMIT 0, 20;
|
||
numeropost maxnumrep
|
||
43506 2
|
||
40143 1
|
||
SELECT (SELECT 1) as a FROM (SELECT 1 FROM t1 HAVING a=1) b;
|
||
ERROR 42S22: Unknown column 'a' in 'having clause'
|
||
SELECT 1 IN (SELECT 1 FROM t2 HAVING a);
|
||
ERROR 42S22: Unknown column 'a' in 'having clause'
|
||
SELECT * from t2 where topic IN (SELECT topic FROM t2 GROUP BY topic);
|
||
mot topic date pseudo
|
||
joce 40143 2002-10-22 joce
|
||
joce 43506 2002-10-22 joce
|
||
SELECT * from t2 where topic IN (SELECT topic FROM t2 GROUP BY topic HAVING topic < 4100);
|
||
mot topic date pseudo
|
||
SELECT * from t2 where topic IN (SELECT SUM(topic) FROM t1);
|
||
mot topic date pseudo
|
||
SELECT * from t2 where topic = any (SELECT topic FROM t2 GROUP BY topic);
|
||
mot topic date pseudo
|
||
joce 40143 2002-10-22 joce
|
||
joce 43506 2002-10-22 joce
|
||
SELECT * from t2 where topic = any (SELECT topic FROM t2 GROUP BY topic HAVING topic < 4100);
|
||
mot topic date pseudo
|
||
SELECT * from t2 where topic = any (SELECT SUM(topic) FROM t1);
|
||
mot topic date pseudo
|
||
SELECT * from t2 where topic = all (SELECT topic FROM t2 GROUP BY topic);
|
||
mot topic date pseudo
|
||
SELECT * from t2 where topic = all (SELECT topic FROM t2 GROUP BY topic HAVING topic < 4100);
|
||
mot topic date pseudo
|
||
joce 40143 2002-10-22 joce
|
||
joce 43506 2002-10-22 joce
|
||
SELECT *, topic = all (SELECT topic FROM t2 GROUP BY topic HAVING topic < 4100) from t2;
|
||
mot topic date pseudo topic = all (SELECT topic FROM t2 GROUP BY topic HAVING topic < 4100)
|
||
joce 40143 2002-10-22 joce 1
|
||
joce 43506 2002-10-22 joce 1
|
||
SELECT * from t2 where topic = all (SELECT SUM(topic) FROM t2);
|
||
mot topic date pseudo
|
||
SELECT * from t2 where topic <> any (SELECT SUM(topic) FROM t2);
|
||
mot topic date pseudo
|
||
joce 40143 2002-10-22 joce
|
||
joce 43506 2002-10-22 joce
|
||
SELECT * from t2 where topic IN (SELECT topic FROM t2 GROUP BY topic HAVING topic < 41000);
|
||
mot topic date pseudo
|
||
joce 40143 2002-10-22 joce
|
||
SELECT * from t2 where topic = any (SELECT topic FROM t2 GROUP BY topic HAVING topic < 41000);
|
||
mot topic date pseudo
|
||
joce 40143 2002-10-22 joce
|
||
SELECT * from t2 where topic = all (SELECT topic FROM t2 GROUP BY topic HAVING topic < 41000);
|
||
mot topic date pseudo
|
||
joce 40143 2002-10-22 joce
|
||
SELECT *, topic = all (SELECT topic FROM t2 GROUP BY topic HAVING topic < 41000) from t2;
|
||
mot topic date pseudo topic = all (SELECT topic FROM t2 GROUP BY topic HAVING topic < 41000)
|
||
joce 40143 2002-10-22 joce 1
|
||
joce 43506 2002-10-22 joce 0
|
||
drop table t1,t2;
|
||
CREATE TABLE `t1` (
|
||
`numeropost` mediumint(8) unsigned NOT NULL auto_increment,
|
||
`maxnumrep` int(10) unsigned NOT NULL default '0',
|
||
PRIMARY KEY (`numeropost`),
|
||
UNIQUE KEY `maxnumrep` (`maxnumrep`)
|
||
) TYPE=MyISAM ROW_FORMAT=FIXED;
|
||
INSERT INTO t1 (numeropost,maxnumrep) VALUES (1,0),(2,1);
|
||
select numeropost as a FROM t1 GROUP BY (SELECT 1 FROM t1 HAVING a=1);
|
||
ERROR 21000: Subselect returns more than 1 record
|
||
select numeropost as a FROM t1 ORDER BY (SELECT 1 FROM t1 HAVING a=1);
|
||
ERROR 21000: Subselect returns more than 1 record
|
||
drop table t1;
|
||
create table t1 (a int);
|
||
insert into t1 values (1),(2),(3);
|
||
(select * from t1) union (select * from t1) order by (select a from t1 limit 1);
|
||
a
|
||
1
|
||
2
|
||
3
|
||
drop table t1;
|
||
CREATE TABLE t1 (field char(1) NOT NULL DEFAULT 'b');
|
||
INSERT INTO t1 VALUES ();
|
||
SELECT field FROM t1 WHERE 1=(SELECT 1 UNION ALL SELECT 1 FROM (SELECT 1) a HAVING field='b');
|
||
ERROR 21000: Subselect returns more than 1 record
|
||
drop table t1;
|
||
CREATE TABLE `t1` (
|
||
`numeropost` mediumint(8) unsigned NOT NULL default '0',
|
||
`numreponse` int(10) unsigned NOT NULL auto_increment,
|
||
`pseudo` varchar(35) NOT NULL default '',
|
||
PRIMARY KEY (`numeropost`,`numreponse`),
|
||
UNIQUE KEY `numreponse` (`numreponse`),
|
||
KEY `pseudo` (`pseudo`,`numeropost`)
|
||
) TYPE=MyISAM;
|
||
SELECT (SELECT numeropost FROM t1 HAVING numreponse=a),numreponse FROM (SELECT * FROM t1) as a;
|
||
ERROR 42S22: Reference 'numreponse' not supported (forward reference in item list)
|
||
SELECT numreponse, (SELECT numeropost FROM t1 HAVING numreponse=a) FROM (SELECT * FROM t1) as a;
|
||
ERROR 42S22: Unknown column 'a' in 'having clause'
|
||
SELECT numreponse, (SELECT numeropost FROM t1 HAVING numreponse=1) FROM (SELECT * FROM t1) as a;
|
||
numreponse (SELECT numeropost FROM t1 HAVING numreponse=1)
|
||
INSERT INTO t1 (numeropost,numreponse,pseudo) VALUES (1,1,'joce'),(1,2,'joce'),(1,3,'test');
|
||
EXPLAIN SELECT numreponse FROM t1 WHERE numeropost='1' AND numreponse=(SELECT 1 FROM t1 WHERE numeropost='1');
|
||
ERROR 21000: Subselect returns more than 1 record
|
||
EXPLAIN SELECT MAX(numreponse) FROM t1 WHERE numeropost='1';
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 SIMPLE NULL NULL NULL NULL NULL NULL NULL Select tables optimized away
|
||
EXPLAIN SELECT numreponse FROM t1 WHERE numeropost='1' AND numreponse=(SELECT MAX(numreponse) FROM t1 WHERE numeropost='1');
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 PRIMARY t1 const PRIMARY,numreponse PRIMARY 7 const,const 1
|
||
2 SUBQUERY NULL NULL NULL NULL NULL NULL NULL Select tables optimized away
|
||
drop table t1;
|
||
CREATE TABLE t1 (a int(1));
|
||
INSERT INTO t1 VALUES (1);
|
||
SELECT 1 FROM (SELECT a FROM t1) b HAVING (SELECT b.a)=1;
|
||
1
|
||
1
|
||
drop table t1;
|
||
create table t1 (a int NOT NULL, b int, primary key (a));
|
||
create table t2 (a int NOT NULL, b int, primary key (a));
|
||
insert into t1 values (0, 10),(1, 11),(2, 12);
|
||
insert into t2 values (1, 21),(2, 22),(3, 23);
|
||
select * from t1;
|
||
a b
|
||
0 10
|
||
1 11
|
||
2 12
|
||
update t1 set b= (select b from t1);
|
||
ERROR HY000: You can't specify target table 't1' for update in FROM clause
|
||
update t1 set b= (select b from t2);
|
||
ERROR 21000: Subselect returns more than 1 record
|
||
update t1 set b= (select b from t2 where t1.a = t2.a);
|
||
select * from t1;
|
||
a b
|
||
0 NULL
|
||
1 21
|
||
2 22
|
||
drop table t1, t2;
|
||
create table t1 (a int NOT NULL, b int, primary key (a));
|
||
create table t2 (a int NOT NULL, b int, primary key (a));
|
||
insert into t1 values (0, 10),(1, 11),(2, 12);
|
||
insert into t2 values (1, 21),(2, 12),(3, 23);
|
||
select * from t1;
|
||
a b
|
||
0 10
|
||
1 11
|
||
2 12
|
||
select * from t1 where b = (select b from t2 where t1.a = t2.a);
|
||
a b
|
||
2 12
|
||
delete from t1 where b = (select b from t1);
|
||
ERROR HY000: You can't specify target table 't1' for update in FROM clause
|
||
delete from t1 where b = (select b from t2);
|
||
ERROR 21000: Subselect returns more than 1 record
|
||
delete from t1 where b = (select b from t2 where t1.a = t2.a);
|
||
select * from t1;
|
||
a b
|
||
0 10
|
||
1 11
|
||
drop table t1, t2;
|
||
create table t11 (a int NOT NULL, b int, primary key (a));
|
||
create table t12 (a int NOT NULL, b int, primary key (a));
|
||
create table t2 (a int NOT NULL, b int, primary key (a));
|
||
insert into t11 values (0, 10),(1, 11),(2, 12);
|
||
insert into t12 values (33, 10),(22, 11),(2, 12);
|
||
insert into t2 values (1, 21),(2, 12),(3, 23);
|
||
select * from t11;
|
||
a b
|
||
0 10
|
||
1 11
|
||
2 12
|
||
select * from t12;
|
||
a b
|
||
33 10
|
||
22 11
|
||
2 12
|
||
delete t11.*, t12.* from t11,t12 where t11.a = t12.a and t11.b = (select b from t12 where t11.a = t12.a);
|
||
ERROR HY000: You can't specify target table 't12' for update in FROM clause
|
||
delete t11.*, t12.* from t11,t12 where t11.a = t12.a and t11.b = (select b from t2);
|
||
ERROR 21000: Subselect returns more than 1 record
|
||
delete t11.*, t12.* from t11,t12 where t11.a = t12.a and t11.b = (select b from t2 where t11.a = t2.a);
|
||
select * from t11;
|
||
a b
|
||
0 10
|
||
1 11
|
||
select * from t12;
|
||
a b
|
||
33 10
|
||
22 11
|
||
drop table t11, t12, t2;
|
||
CREATE TABLE t1 (x int);
|
||
create table t2 (a int);
|
||
create table t3 (b int);
|
||
insert into t2 values (1);
|
||
insert into t3 values (1),(2);
|
||
INSERT INTO t1 (x) VALUES ((SELECT x FROM t1));
|
||
ERROR HY000: You can't specify target table 't1' for update in FROM clause
|
||
INSERT INTO t1 (x) VALUES ((SELECT b FROM t3));
|
||
ERROR 21000: Subselect returns more than 1 record
|
||
INSERT INTO t1 (x) VALUES ((SELECT a FROM t2));
|
||
select * from t1;
|
||
x
|
||
1
|
||
insert into t2 values (1);
|
||
INSERT DELAYED INTO t1 (x) VALUES ((SELECT SUM(a) FROM t2));
|
||
select * from t1;
|
||
x
|
||
1
|
||
2
|
||
INSERT INTO t1 (x) select (SELECT SUM(a)+1 FROM t2) FROM t2;
|
||
select * from t1;
|
||
x
|
||
1
|
||
2
|
||
3
|
||
3
|
||
INSERT INTO t1 (x) select (SELECT SUM(x)+2 FROM t1) FROM t2;
|
||
INSERT DELAYED INTO t1 (x) VALUES ((SELECT SUM(x) FROM t2));
|
||
ERROR 42S22: Unknown column 'x' in 'field list'
|
||
INSERT DELAYED INTO t1 (x) VALUES ((SELECT SUM(a) FROM t2));
|
||
select * from t1;
|
||
x
|
||
1
|
||
2
|
||
3
|
||
3
|
||
11
|
||
11
|
||
2
|
||
drop table t1, t2, t3;
|
||
CREATE TABLE t1 (x int not null, y int, primary key (x));
|
||
create table t2 (a int);
|
||
create table t3 (a int);
|
||
insert into t2 values (1);
|
||
insert into t3 values (1),(2);
|
||
select * from t1;
|
||
x y
|
||
replace into t1 (x, y) VALUES ((SELECT x FROM t1), (SELECT a+1 FROM t2));
|
||
ERROR HY000: You can't specify target table 't1' for update in FROM clause
|
||
replace into t1 (x, y) VALUES ((SELECT a FROM t3), (SELECT a+1 FROM t2));
|
||
ERROR 21000: Subselect returns more than 1 record
|
||
replace into t1 (x, y) VALUES ((SELECT a FROM t2), (SELECT a+1 FROM t2));
|
||
select * from t1;
|
||
x y
|
||
1 2
|
||
replace into t1 (x, y) VALUES ((SELECT a FROM t2), (SELECT a+2 FROM t2));
|
||
select * from t1;
|
||
x y
|
||
1 3
|
||
replace DELAYED into t1 (x, y) VALUES ((SELECT a+3 FROM t2), (SELECT a FROM t2));
|
||
select * from t1;
|
||
x y
|
||
1 3
|
||
4 1
|
||
replace DELAYED into t1 (x, y) VALUES ((SELECT a+3 FROM t2), (SELECT a+1 FROM t2));
|
||
select * from t1;
|
||
x y
|
||
1 3
|
||
4 2
|
||
replace LOW_PRIORITY into t1 (x, y) VALUES ((SELECT a+1 FROM t2), (SELECT a FROM t2));
|
||
select * from t1;
|
||
x y
|
||
1 3
|
||
4 2
|
||
2 1
|
||
drop table t1, t2, t3;
|
||
SELECT * FROM (SELECT 1) b WHERE 1 IN (SELECT *);
|
||
ERROR HY000: No tables used
|
||
CREATE TABLE t2 (id int(11) default NULL, KEY id (id)) TYPE=MyISAM CHARSET=latin1;
|
||
INSERT INTO t2 VALUES (1),(2);
|
||
SELECT * FROM t2 WHERE id IN (SELECT 1);
|
||
id
|
||
1
|
||
EXPLAIN SELECT * FROM t2 WHERE id IN (SELECT 1);
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 PRIMARY t2 ref id id 5 const 1 Using where; Using index
|
||
Warnings:
|
||
Note 1248 Select 2 was reduced during optimisation
|
||
SELECT * FROM t2 WHERE id IN (SELECT 1 UNION SELECT 3);
|
||
id
|
||
1
|
||
SELECT * FROM t2 WHERE id IN (SELECT 1+(select 1));
|
||
id
|
||
2
|
||
EXPLAIN SELECT * FROM t2 WHERE id IN (SELECT 1+(select 1));
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 PRIMARY t2 ref id id 5 const 1 Using where; Using index
|
||
Warnings:
|
||
Note 1248 Select 3 was reduced during optimisation
|
||
Note 1248 Select 2 was reduced during optimisation
|
||
EXPLAIN SELECT * FROM t2 WHERE id IN (SELECT 1 UNION SELECT 3);
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 PRIMARY t2 index NULL id 5 NULL 2 Using where; Using index
|
||
2 DEPENDENT SUBQUERY NULL NULL NULL NULL NULL NULL NULL No tables used
|
||
3 DEPENDENT UNION NULL NULL NULL NULL NULL NULL NULL No tables used
|
||
SELECT * FROM t2 WHERE id IN (SELECT 5 UNION SELECT 3);
|
||
id
|
||
SELECT * FROM t2 WHERE id IN (SELECT 5 UNION SELECT 2);
|
||
id
|
||
2
|
||
INSERT INTO t2 VALUES ((SELECT * FROM t2));
|
||
ERROR HY000: You can't specify target table 't2' for update in FROM clause
|
||
INSERT INTO t2 VALUES ((SELECT id FROM t2));
|
||
ERROR HY000: You can't specify target table 't2' for update in FROM clause
|
||
SELECT * FROM t2;
|
||
id
|
||
1
|
||
2
|
||
CREATE TABLE t1 (id int(11) default NULL, KEY id (id)) TYPE=MyISAM CHARSET=latin1;
|
||
INSERT INTO t1 values (1),(1);
|
||
UPDATE t2 SET id=(SELECT * FROM t1);
|
||
ERROR 21000: Subselect returns more than 1 record
|
||
drop table t2, t1;
|
||
create table t1 (a int);
|
||
insert into t1 values (1),(2),(3);
|
||
select 1 IN (SELECT * from t1);
|
||
1 IN (SELECT * from t1)
|
||
1
|
||
select 10 IN (SELECT * from t1);
|
||
10 IN (SELECT * from t1)
|
||
0
|
||
select NULL IN (SELECT * from t1);
|
||
NULL IN (SELECT * from t1)
|
||
NULL
|
||
update t1 set a=NULL where a=2;
|
||
select 1 IN (SELECT * from t1);
|
||
1 IN (SELECT * from t1)
|
||
1
|
||
select 3 IN (SELECT * from t1);
|
||
3 IN (SELECT * from t1)
|
||
1
|
||
select 10 IN (SELECT * from t1);
|
||
10 IN (SELECT * from t1)
|
||
NULL
|
||
select 1 > ALL (SELECT * from t1);
|
||
1 > ALL (SELECT * from t1)
|
||
0
|
||
select 10 > ALL (SELECT * from t1);
|
||
10 > ALL (SELECT * from t1)
|
||
NULL
|
||
select 1 > ANY (SELECT * from t1);
|
||
1 > ANY (SELECT * from t1)
|
||
NULL
|
||
select 10 > ANY (SELECT * from t1);
|
||
10 > ANY (SELECT * from t1)
|
||
1
|
||
drop table t1;
|
||
create table t1 (a varchar(20));
|
||
insert into t1 values ('A'),('BC'),('DEF');
|
||
select 'A' IN (SELECT * from t1);
|
||
'A' IN (SELECT * from t1)
|
||
1
|
||
select 'XYZS' IN (SELECT * from t1);
|
||
'XYZS' IN (SELECT * from t1)
|
||
0
|
||
select NULL IN (SELECT * from t1);
|
||
NULL IN (SELECT * from t1)
|
||
NULL
|
||
update t1 set a=NULL where a='BC';
|
||
select 'A' IN (SELECT * from t1);
|
||
'A' IN (SELECT * from t1)
|
||
1
|
||
select 'DEF' IN (SELECT * from t1);
|
||
'DEF' IN (SELECT * from t1)
|
||
1
|
||
select 'XYZS' IN (SELECT * from t1);
|
||
'XYZS' IN (SELECT * from t1)
|
||
NULL
|
||
select 'A' > ALL (SELECT * from t1);
|
||
'A' > ALL (SELECT * from t1)
|
||
0
|
||
select 'XYZS' > ALL (SELECT * from t1);
|
||
'XYZS' > ALL (SELECT * from t1)
|
||
NULL
|
||
select 'A' > ANY (SELECT * from t1);
|
||
'A' > ANY (SELECT * from t1)
|
||
NULL
|
||
select 'XYZS' > ANY (SELECT * from t1);
|
||
'XYZS' > ANY (SELECT * from t1)
|
||
1
|
||
drop table t1;
|
||
create table t1 (a float);
|
||
insert into t1 values (1.5),(2.5),(3.5);
|
||
select 1.5 IN (SELECT * from t1);
|
||
1.5 IN (SELECT * from t1)
|
||
1
|
||
select 10.5 IN (SELECT * from t1);
|
||
10.5 IN (SELECT * from t1)
|
||
0
|
||
select NULL IN (SELECT * from t1);
|
||
NULL IN (SELECT * from t1)
|
||
NULL
|
||
update t1 set a=NULL where a=2.5;
|
||
select 1.5 IN (SELECT * from t1);
|
||
1.5 IN (SELECT * from t1)
|
||
1
|
||
select 3.5 IN (SELECT * from t1);
|
||
3.5 IN (SELECT * from t1)
|
||
1
|
||
select 10.5 IN (SELECT * from t1);
|
||
10.5 IN (SELECT * from t1)
|
||
NULL
|
||
select 1.5 > ALL (SELECT * from t1);
|
||
1.5 > ALL (SELECT * from t1)
|
||
0
|
||
select 10.5 > ALL (SELECT * from t1);
|
||
10.5 > ALL (SELECT * from t1)
|
||
NULL
|
||
select 1.5 > ANY (SELECT * from t1);
|
||
1.5 > ANY (SELECT * from t1)
|
||
NULL
|
||
select 10.5 > ANY (SELECT * from t1);
|
||
10.5 > ANY (SELECT * from t1)
|
||
1
|
||
explain select (select a+1) from t1;
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 PRIMARY t1 ALL NULL NULL NULL NULL 3
|
||
Warnings:
|
||
Note 1275 Field or reference 'a' of SELECT #2 was resolved in SELECT #1
|
||
Note 1248 Select 2 was reduced during optimisation
|
||
select (select a+1) from t1;
|
||
(select a+1)
|
||
2.5
|
||
NULL
|
||
4.5
|
||
drop table t1;
|
||
CREATE TABLE t1 (a int(11) NOT NULL default '0', PRIMARY KEY (a));
|
||
CREATE TABLE t2 (a int(11) default '0', INDEX (a));
|
||
INSERT INTO t1 VALUES (1),(2),(3),(4);
|
||
INSERT INTO t2 VALUES (1),(2),(3);
|
||
SELECT t1.a, t1.a in (select t2.a from t2) FROM t1;
|
||
a t1.a in (select t2.a from t2)
|
||
1 1
|
||
2 1
|
||
3 1
|
||
4 0
|
||
explain SELECT t1.a, t1.a in (select t2.a from t2) FROM t1;
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 PRIMARY t1 index NULL PRIMARY 4 NULL 4 Using index
|
||
2 DEPENDENT SUBQUERY t2 index_in a a 5 func 2 Using index
|
||
CREATE TABLE t3 (a int(11) default '0');
|
||
INSERT INTO t3 VALUES (1),(2),(3);
|
||
SELECT t1.a, t1.a in (select t2.a from t2,t3 where t3.a=t2.a) FROM t1;
|
||
a t1.a in (select t2.a from t2,t3 where t3.a=t2.a)
|
||
1 1
|
||
2 1
|
||
3 1
|
||
4 0
|
||
explain SELECT t1.a, t1.a in (select t2.a from t2,t3 where t3.a=t2.a) FROM t1;
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 PRIMARY t1 index NULL PRIMARY 4 NULL 4 Using index
|
||
2 DEPENDENT SUBQUERY t2 ref_or_null a a 5 func 2 Using where; Using index
|
||
2 DEPENDENT SUBQUERY t3 ALL NULL NULL NULL NULL 3 Using where
|
||
drop table t1,t2,t3;
|
||
create table t1 (a float);
|
||
select 10.5 IN (SELECT * from t1 LIMIT 1);
|
||
ERROR 42000: This version of MySQL doesn't yet support 'LIMIT & IN/ALL/ANY/SOME subquery'
|
||
select 10.5 IN (SELECT * from t1 LIMIT 1 UNION SELECT 1.5);
|
||
ERROR 42000: This version of MySQL doesn't yet support 'LIMIT & IN/ALL/ANY/SOME subquery'
|
||
drop table t1;
|
||
create table t1 (a int, b int, c varchar(10));
|
||
create table t2 (a int);
|
||
insert into t1 values (1,2,'a'),(2,3,'b'),(3,4,'c');
|
||
insert into t2 values (1),(2),(NULL);
|
||
select a, (select a,b,c from t1 where t1.a=t2.a) = ROW(a,2,'a'),(select c from t1 where a=t2.a) from t2;
|
||
a (select a,b,c from t1 where t1.a=t2.a) = ROW(a,2,'a') (select c from t1 where a=t2.a)
|
||
1 1 a
|
||
2 0 b
|
||
NULL NULL NULL
|
||
select a, (select a,b,c from t1 where t1.a=t2.a) = ROW(a,3,'b'),(select c from t1 where a=t2.a) from t2;
|
||
a (select a,b,c from t1 where t1.a=t2.a) = ROW(a,3,'b') (select c from t1 where a=t2.a)
|
||
1 0 a
|
||
2 1 b
|
||
NULL NULL NULL
|
||
select a, (select a,b,c from t1 where t1.a=t2.a) = ROW(a,4,'c'),(select c from t1 where a=t2.a) from t2;
|
||
a (select a,b,c from t1 where t1.a=t2.a) = ROW(a,4,'c') (select c from t1 where a=t2.a)
|
||
1 0 a
|
||
2 0 b
|
||
NULL NULL NULL
|
||
drop table t1,t2;
|
||
create table t1 (a int, b real, c varchar(10));
|
||
insert into t1 values (1, 1, 'a'), (2,2,'b'), (NULL, 2, 'b');
|
||
select ROW(1, 1, 'a') IN (select a,b,c from t1);
|
||
ROW(1, 1, 'a') IN (select a,b,c from t1)
|
||
1
|
||
select ROW(1, 2, 'a') IN (select a,b,c from t1);
|
||
ROW(1, 2, 'a') IN (select a,b,c from t1)
|
||
NULL
|
||
select ROW(1, 1, 'a') IN (select b,a,c from t1);
|
||
ROW(1, 1, 'a') IN (select b,a,c from t1)
|
||
1
|
||
select ROW(1, 1, 'a') IN (select a,b,c from t1 where a is not null);
|
||
ROW(1, 1, 'a') IN (select a,b,c from t1 where a is not null)
|
||
1
|
||
select ROW(1, 2, 'a') IN (select a,b,c from t1 where a is not null);
|
||
ROW(1, 2, 'a') IN (select a,b,c from t1 where a is not null)
|
||
0
|
||
select ROW(1, 1, 'a') IN (select b,a,c from t1 where a is not null);
|
||
ROW(1, 1, 'a') IN (select b,a,c from t1 where a is not null)
|
||
1
|
||
select ROW(1, 1, 'a') IN (select a,b,c from t1 where c='b' or c='a');
|
||
ROW(1, 1, 'a') IN (select a,b,c from t1 where c='b' or c='a')
|
||
1
|
||
select ROW(1, 2, 'a') IN (select a,b,c from t1 where c='b' or c='a');
|
||
ROW(1, 2, 'a') IN (select a,b,c from t1 where c='b' or c='a')
|
||
NULL
|
||
select ROW(1, 1, 'a') IN (select b,a,c from t1 where c='b' or c='a');
|
||
ROW(1, 1, 'a') IN (select b,a,c from t1 where c='b' or c='a')
|
||
1
|
||
select ROW(1, 1, 'a') IN (select b,a,c from t1 limit 2);
|
||
ERROR 42000: This version of MySQL doesn't yet support 'LIMIT & IN/ALL/ANY/SOME subquery'
|
||
drop table t1;
|
||
create table t1 (a int);
|
||
insert into t1 values (1);
|
||
do @a:=(SELECT a from t1);
|
||
select @a;
|
||
@a
|
||
1
|
||
set @a:=2;
|
||
set @a:=(SELECT a from t1);
|
||
select @a;
|
||
@a
|
||
1
|
||
drop table t1;
|
||
do (SELECT a from t1);
|
||
ERROR 42S02: Table 'test.t1' doesn't exist
|
||
set @a:=(SELECT a from t1);
|
||
ERROR 42S02: Table 'test.t1' doesn't exist
|
||
CREATE TABLE t1 (a int, KEY(a));
|
||
HANDLER t1 OPEN;
|
||
HANDLER t1 READ a=((SELECT 1));
|
||
ERROR 42000: You have an error in your SQL syntax. Check the manual that corresponds to your MySQL server version for the right syntax to use
|
||
HANDLER t1 CLOSE;
|
||
drop table t1;
|
||
create table t1 (a int);
|
||
create table t2 (b int);
|
||
insert into t1 values (1),(2);
|
||
insert into t2 values (1);
|
||
select a from t1 where a in (select a from t1 where a in (select b from t2));
|
||
a
|
||
1
|
||
drop table t1, t2;
|
||
create table t1 (a int, b int);
|
||
create table t2 like t1;
|
||
insert into t1 values (1,2),(1,3),(1,4),(1,5);
|
||
insert into t2 values (1,2),(1,3);
|
||
select * from t1 where row(a,b) in (select a,b from t2);
|
||
a b
|
||
1 2
|
||
1 3
|
||
drop table t1, t2;
|
||
CREATE TABLE `t1` (`i` int(11) NOT NULL default '0',PRIMARY KEY (`i`)) TYPE=MyISAM CHARSET=latin1;
|
||
INSERT INTO t1 VALUES (1);
|
||
UPDATE t1 SET i=i+1 WHERE i=(SELECT MAX(i));
|
||
ERROR HY000: Invalid use of group function
|
||
drop table t1;
|
||
CREATE TABLE t1 (a int(1));
|
||
EXPLAIN SELECT (SELECT RAND() FROM t1) FROM t1;
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 PRIMARY t1 system NULL NULL NULL NULL 0 const row not found
|
||
2 UNCACHEABLE SUBQUERY t1 system NULL NULL NULL NULL 0 const row not found
|
||
EXPLAIN SELECT (SELECT ENCRYPT('test') FROM t1) FROM t1;
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 PRIMARY t1 system NULL NULL NULL NULL 0 const row not found
|
||
2 UNCACHEABLE SUBQUERY t1 system NULL NULL NULL NULL 0 const row not found
|
||
EXPLAIN SELECT (SELECT BENCHMARK(1,1) FROM t1) FROM t1;
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 PRIMARY t1 system NULL NULL NULL NULL 0 const row not found
|
||
2 UNCACHEABLE SUBQUERY t1 system NULL NULL NULL NULL 0 const row not found
|
||
drop table t1;
|
||
CREATE TABLE `t1` (
|
||
`mot` varchar(30) character set latin1 NOT NULL default '',
|
||
`topic` mediumint(8) unsigned NOT NULL default '0',
|
||
`date` date NOT NULL default '0000-00-00',
|
||
`pseudo` varchar(35) character set latin1 NOT NULL default '',
|
||
PRIMARY KEY (`mot`,`pseudo`,`date`,`topic`),
|
||
KEY `pseudo` (`pseudo`,`date`,`topic`),
|
||
KEY `topic` (`topic`)
|
||
) TYPE=MyISAM CHARSET=latin1 ROW_FORMAT=DYNAMIC;
|
||
CREATE TABLE `t2` (
|
||
`mot` varchar(30) character set latin1 NOT NULL default '',
|
||
`topic` mediumint(8) unsigned NOT NULL default '0',
|
||
`date` date NOT NULL default '0000-00-00',
|
||
`pseudo` varchar(35) character set latin1 NOT NULL default '',
|
||
PRIMARY KEY (`mot`,`pseudo`,`date`,`topic`),
|
||
KEY `pseudo` (`pseudo`,`date`,`topic`),
|
||
KEY `topic` (`topic`)
|
||
) TYPE=MyISAM CHARSET=latin1 ROW_FORMAT=DYNAMIC;
|
||
CREATE TABLE `t3` (
|
||
`numeropost` mediumint(8) unsigned NOT NULL auto_increment,
|
||
`maxnumrep` int(10) unsigned NOT NULL default '0',
|
||
PRIMARY KEY (`numeropost`),
|
||
UNIQUE KEY `maxnumrep` (`maxnumrep`)
|
||
) TYPE=MyISAM CHARSET=latin1;
|
||
INSERT INTO t1 VALUES ('joce','1','','joce'),('test','2','','test');
|
||
Warnings:
|
||
Warning 1264 Data truncated for column 'date' at row 1
|
||
Warning 1264 Data truncated for column 'date' at row 2
|
||
INSERT INTO t2 VALUES ('joce','1','','joce'),('test','2','','test');
|
||
Warnings:
|
||
Warning 1264 Data truncated for column 'date' at row 1
|
||
Warning 1264 Data truncated for column 'date' at row 2
|
||
INSERT INTO t3 VALUES (1,1);
|
||
SELECT DISTINCT topic FROM t2 WHERE NOT EXISTS(SELECT * FROM t3 WHERE
|
||
numeropost=topic);
|
||
topic
|
||
2
|
||
select * from t1;
|
||
mot topic date pseudo
|
||
joce 1 0000-00-00 joce
|
||
test 2 0000-00-00 test
|
||
DELETE FROM t1 WHERE topic IN (SELECT DISTINCT topic FROM t2 WHERE NOT
|
||
EXISTS(SELECT * FROM t3 WHERE numeropost=topic));
|
||
select * from t1;
|
||
mot topic date pseudo
|
||
joce 1 0000-00-00 joce
|
||
drop table t1, t2, t3;
|
||
SELECT * FROM (SELECT 1 as a,(SELECT a)) a;
|
||
a (SELECT a)
|
||
1 1
|
||
CREATE TABLE t1 SELECT * FROM (SELECT 1 as a,(SELECT 1)) a;
|
||
SHOW CREATE TABLE t1;
|
||
Table Create Table
|
||
t1 CREATE TABLE `t1` (
|
||
`a` bigint(1) NOT NULL default '0',
|
||
`(SELECT 1)` bigint(1) NOT NULL default '0'
|
||
) TYPE=MyISAM CHARSET=latin1
|
||
drop table t1;
|
||
CREATE TABLE t1 SELECT * FROM (SELECT 1 as a,(SELECT a)) a;
|
||
SHOW CREATE TABLE t1;
|
||
Table Create Table
|
||
t1 CREATE TABLE `t1` (
|
||
`a` bigint(1) NOT NULL default '0',
|
||
`(SELECT a)` bigint(1) NOT NULL default '0'
|
||
) TYPE=MyISAM CHARSET=latin1
|
||
drop table t1;
|
||
CREATE TABLE t1 SELECT * FROM (SELECT 1 as a,(SELECT a+0)) a;
|
||
SHOW CREATE TABLE t1;
|
||
Table Create Table
|
||
t1 CREATE TABLE `t1` (
|
||
`a` bigint(1) NOT NULL default '0',
|
||
`(SELECT a+0)` bigint(17) NOT NULL default '0'
|
||
) TYPE=MyISAM CHARSET=latin1
|
||
drop table t1;
|
||
CREATE TABLE t1 SELECT (SELECT 1 as a UNION SELECT 1+1 limit 1,1) as a;
|
||
SHOW CREATE TABLE t1;
|
||
Table Create Table
|
||
t1 CREATE TABLE `t1` (
|
||
`a` bigint(17) NOT NULL default '0'
|
||
) TYPE=MyISAM CHARSET=latin1
|
||
drop table t1;
|
||
create table t1 (a int);
|
||
insert into t1 values (1), (2), (3);
|
||
explain select a,(select (select rand() from t1 limit 1) from t1 limit 1)
|
||
from t1;
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 PRIMARY t1 ALL NULL NULL NULL NULL 3
|
||
2 UNCACHEABLE SUBQUERY t1 ALL NULL NULL NULL NULL 3
|
||
3 UNCACHEABLE SUBQUERY t1 ALL NULL NULL NULL NULL 3
|
||
drop table t1;
|
||
select t1.Continent, t2.Name, t2.Population from t1 LEFT JOIN t2 ON t1.Code = t2.Country where t2.Population IN (select max(t2.Population) AS Population from t2, t1 where t2.Country = t1.Code group by Continent);
|
||
ERROR 42S02: Table 'test.t1' doesn't exist
|
||
CREATE TABLE t1 (
|
||
ID int(11) NOT NULL auto_increment,
|
||
name char(35) NOT NULL default '',
|
||
t2 char(3) NOT NULL default '',
|
||
District char(20) NOT NULL default '',
|
||
Population int(11) NOT NULL default '0',
|
||
PRIMARY KEY (ID)
|
||
) TYPE=MyISAM;
|
||
INSERT INTO t1 VALUES (130,'Sydney','AUS','New South Wales',3276207);
|
||
INSERT INTO t1 VALUES (131,'Melbourne','AUS','Victoria',2865329);
|
||
INSERT INTO t1 VALUES (132,'Brisbane','AUS','Queensland',1291117);
|
||
CREATE TABLE t2 (
|
||
Code char(3) NOT NULL default '',
|
||
Name char(52) NOT NULL default '',
|
||
Continent enum('Asia','Europe','North America','Africa','Oceania','Antarctica','South America') NOT NULL default 'Asia',
|
||
Region char(26) NOT NULL default '',
|
||
SurfaceArea float(10,2) NOT NULL default '0.00',
|
||
IndepYear smallint(6) default NULL,
|
||
Population int(11) NOT NULL default '0',
|
||
LifeExpectancy float(3,1) default NULL,
|
||
GNP float(10,2) default NULL,
|
||
GNPOld float(10,2) default NULL,
|
||
LocalName char(45) NOT NULL default '',
|
||
GovernmentForm char(45) NOT NULL default '',
|
||
HeadOfState char(60) default NULL,
|
||
Capital int(11) default NULL,
|
||
Code2 char(2) NOT NULL default '',
|
||
PRIMARY KEY (Code)
|
||
) TYPE=MyISAM;
|
||
INSERT INTO t2 VALUES ('AUS','Australia','Oceania','Australia and New Zealand',7741220.00,1901,18886000,79.8,351182.00,392911.00,'Australia','Constitutional Monarchy, Federation','Elisabeth II',135,'AU');
|
||
INSERT INTO t2 VALUES ('AZE','Azerbaijan','Asia','Middle East',86600.00,1991,7734000,62.9,4127.00,4100.00,'Az<41>rbaycan','Federal Republic','Heyd<79>r <20>liyev',144,'AZ');
|
||
select t2.Continent, t1.Name, t1.Population from t2 LEFT JOIN t1 ON t2.Code = t1.t2 where t1.Population IN (select max(t1.Population) AS Population from t1, t2 where t1.t2 = t2.Code group by Continent);
|
||
Continent Name Population
|
||
Oceania Sydney 3276207
|
||
drop table t1, t2;
|
||
CREATE TABLE `t1` (
|
||
`id` mediumint(8) unsigned NOT NULL auto_increment,
|
||
`pseudo` varchar(35) character set latin1 NOT NULL default '',
|
||
PRIMARY KEY (`id`),
|
||
UNIQUE KEY `pseudo` (`pseudo`),
|
||
) TYPE=MyISAM PACK_KEYS=1 ROW_FORMAT=DYNAMIC;
|
||
INSERT INTO t1 (pseudo) VALUES ('test');
|
||
SELECT 0 IN (SELECT 1 FROM t1 a);
|
||
0 IN (SELECT 1 FROM t1 a)
|
||
0
|
||
EXPLAIN SELECT 0 IN (SELECT 1 FROM t1 a);
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 PRIMARY NULL NULL NULL NULL NULL NULL NULL No tables used
|
||
2 DEPENDENT SUBQUERY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
|
||
INSERT INTO t1 (pseudo) VALUES ('test1');
|
||
SELECT 0 IN (SELECT 1 FROM t1 a);
|
||
0 IN (SELECT 1 FROM t1 a)
|
||
0
|
||
EXPLAIN SELECT 0 IN (SELECT 1 FROM t1 a);
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 PRIMARY NULL NULL NULL NULL NULL NULL NULL No tables used
|
||
2 DEPENDENT SUBQUERY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
|
||
drop table t1;
|
||
CREATE TABLE `t1` (
|
||
`i` int(11) NOT NULL default '0',
|
||
PRIMARY KEY (`i`)
|
||
) TYPE=MyISAM CHARSET=latin1;
|
||
INSERT INTO t1 VALUES (1);
|
||
UPDATE t1 SET i=i+(SELECT MAX(i) FROM (SELECT 1) t) WHERE i=(SELECT MAX(i));
|
||
ERROR HY000: Invalid use of group function
|
||
UPDATE t1 SET i=i+1 WHERE i=(SELECT MAX(i));
|
||
ERROR HY000: Invalid use of group function
|
||
UPDATE t1 SET t.i=i+(SELECT MAX(i) FROM (SELECT 1) t);
|
||
ERROR 42S02: Unknown table 't' in field list
|
||
drop table t1;
|
||
CREATE TABLE t1 (
|
||
id int(11) default NULL
|
||
) TYPE=MyISAM CHARSET=latin1;
|
||
INSERT INTO t1 VALUES (1),(1),(2),(2),(1),(3);
|
||
CREATE TABLE t2 (
|
||
id int(11) default NULL,
|
||
name varchar(15) default NULL
|
||
) TYPE=MyISAM CHARSET=latin1;
|
||
INSERT INTO t2 VALUES (4,'vita'), (1,'vita'), (2,'vita'), (1,'vita');
|
||
update t1, t2 set t2.name='lenka' where t2.id in (select id from t1);
|
||
select * from t2;
|
||
id name
|
||
4 vita
|
||
1 lenka
|
||
2 lenka
|
||
1 lenka
|
||
drop table t1,t2;
|
||
create table t1 (a int, unique index indexa (a));
|
||
insert into t1 values (-1), (-4), (-2), (NULL);
|
||
select -10 IN (select a from t1 FORCE INDEX (indexa));
|
||
-10 IN (select a from t1 FORCE INDEX (indexa))
|
||
NULL
|
||
drop table t1;
|
||
create table t1 (id int not null auto_increment primary key, salary int, key(salary));
|
||
insert into t1 (salary) values (100),(1000),(10000),(10),(500),(5000),(50000);
|
||
explain SELECT id FROM t1 where salary = (SELECT MAX(salary) FROM t1);
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 PRIMARY t1 ref salary salary 5 const 1 Using where
|
||
2 SUBQUERY NULL NULL NULL NULL NULL NULL NULL Select tables optimized away
|
||
drop table t1;
|
||
CREATE TABLE t1 (
|
||
ID int(10) unsigned NOT NULL auto_increment,
|
||
SUB_ID int(3) unsigned NOT NULL default '0',
|
||
REF_ID int(10) unsigned default NULL,
|
||
REF_SUB int(3) unsigned default '0',
|
||
PRIMARY KEY (ID,SUB_ID),
|
||
UNIQUE KEY t1_PK (ID,SUB_ID),
|
||
KEY t1_FK (REF_ID,REF_SUB),
|
||
KEY t1_REFID (REF_ID)
|
||
) TYPE=MyISAM CHARSET=cp1251;
|
||
INSERT INTO t1 VALUES (1,0,NULL,NULL),(2,0,NULL,NULL);
|
||
SELECT DISTINCT REF_ID FROM t1 WHERE ID= (SELECT DISTINCT REF_ID FROM t1 WHERE ID=2);
|
||
REF_ID
|
||
DROP TABLE t1;
|
||
create table t1 (a int, b int);
|
||
create table t2 (a int, b int);
|
||
insert into t1 values (1,0), (2,0), (3,0);
|
||
insert into t2 values (1,1), (2,1), (3,1), (2,2);
|
||
update ignore t1 set b=(select b from t2 where t1.a=t2.a);
|
||
Warnings:
|
||
Error 1241 Subselect returns more than 1 record
|
||
select * from t1;
|
||
a b
|
||
1 1
|
||
2 NULL
|
||
3 1
|
||
drop table t1, t2;
|
||
create table t1(City VARCHAR(30),Location geometry);
|
||
insert into t1 values("Paris",GeomFromText('POINT(2.33 48.87)'));
|
||
select City from t1 where (select intersects(GeomFromText(AsText(Location)),GeomFromText('Polygon((2 50, 2.5 50, 2.5 47, 2 47, 2 50))'))=0);
|
||
City
|
||
drop table t1;
|
||
CREATE TABLE `t1` (
|
||
`id` mediumint(8) unsigned NOT NULL auto_increment,
|
||
`pseudo` varchar(35) NOT NULL default '',
|
||
`email` varchar(60) NOT NULL default '',
|
||
PRIMARY KEY (`id`),
|
||
UNIQUE KEY `email` (`email`),
|
||
UNIQUE KEY `pseudo` (`pseudo`),
|
||
) TYPE=MyISAM CHARSET=latin1 PACK_KEYS=1 ROW_FORMAT=DYNAMIC;
|
||
INSERT INTO t1 (id,pseudo,email) VALUES (1,'test','test'),(2,'test1','test1');
|
||
SELECT pseudo as a, pseudo as b FROM t1 GROUP BY (SELECT a) ORDER BY (SELECT id*1);
|
||
a b
|
||
test test
|
||
test1 test1
|
||
drop table if exists t1;
|
||
(SELECT 1 as a) UNION (SELECT 1) ORDER BY (SELECT a+0);
|
||
a
|
||
1
|
||
CREATE TABLE t1
|
||
(
|
||
FOLDERID VARCHAR(32)BINARY NOT NULL
|
||
, FOLDERNAME VARCHAR(255)BINARY NOT NULL
|
||
, CREATOR VARCHAR(255)BINARY
|
||
, CREATED TIMESTAMP NOT NULL
|
||
, DESCRIPTION VARCHAR(255)BINARY
|
||
, FOLDERTYPE INTEGER NOT NULL
|
||
, MODIFIED TIMESTAMP
|
||
, MODIFIER VARCHAR(255)BINARY
|
||
, FOLDERSIZE INTEGER NOT NULL
|
||
, PARENTID VARCHAR(32)BINARY
|
||
, REPID VARCHAR(32)BINARY
|
||
, ORIGINATOR INTEGER
|
||
, PRIMARY KEY ( FOLDERID )
|
||
) TYPE=InnoDB;
|
||
CREATE INDEX FFOLDERID_IDX ON t1 (FOLDERID);
|
||
CREATE INDEX CMFLDRPARNT_IDX ON t1 (PARENTID);
|
||
INSERT INTO t1 VALUES("0c9aab05b15048c59bc35c8461507deb", "System", "System", "2003-06-05 16:30:00", "The system content repository folder.", "3", "2003-06-05 16:30:00", "System", "0", NULL, "9c9aab05b15048c59bc35c8461507deb", "1");
|
||
INSERT INTO t1 VALUES("2f6161e879db43c1a5b82c21ddc49089", "Default", "System", "2003-06-09 10:52:02", "The default content repository folder.", "3", "2003-06-05 16:30:00", "System", "0", NULL, "03eea05112b845949f3fd03278b5fe43", "1");
|
||
INSERT INTO t1 VALUES("c373e9f5ad0791724315444553544200", "AddDocumentTest", "admin", "2003-06-09 10:51:25", "Movie Reviews", "0", "2003-06-09 10:51:25", "admin", "0", "2f6161e879db43c1a5b82c21ddc49089", "03eea05112b845949f3fd03278b5fe43", NULL);
|
||
SELECT 'c373e9f5ad0791a0dab5444553544200' IN(SELECT t1.FOLDERID FROM t1 WHERE t1.PARENTID='2f6161e879db43c1a5b82c21ddc49089' AND t1.FOLDERNAME = 'Level1');
|
||
'c373e9f5ad0791a0dab5444553544200' IN(SELECT t1.FOLDERID FROM t1 WHERE t1.PARENTID='2f6161e879db43c1a5b82c21ddc49089' AND t1.FOLDERNAME = 'Level1')
|
||
0
|
||
drop table t1;
|
||
create table t1 (a int not null, b int, primary key (a));
|
||
create table t2 (a int not null, primary key (a));
|
||
create table t3 (a int not null, b int, primary key (a));
|
||
insert into t1 values (1,10), (2,20), (3,30), (4,40);
|
||
insert into t2 values (2), (3), (4), (5);
|
||
insert into t3 values (10,3), (20,4), (30,5);
|
||
select * from t2 where t2.a in (select a from t1);
|
||
a
|
||
2
|
||
3
|
||
4
|
||
explain select * from t2 where t2.a in (select a from t1);
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 PRIMARY t2 index NULL PRIMARY 4 NULL 4 Using where; Using index
|
||
2 DEPENDENT SUBQUERY t1 simple_in PRIMARY PRIMARY 4 func 1 Using index
|
||
select * from t2 where t2.a in (select a from t1 where t1.b <> 30);
|
||
a
|
||
2
|
||
4
|
||
explain select * from t2 where t2.a in (select a from t1 where t1.b <> 30);
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 PRIMARY t2 index NULL PRIMARY 4 NULL 4 Using where; Using index
|
||
2 DEPENDENT SUBQUERY t1 simple_in PRIMARY PRIMARY 4 func 1 Using index; Using where
|
||
select * from t2 where t2.a in (select t1.a from t1,t3 where t1.b=t3.a);
|
||
a
|
||
2
|
||
3
|
||
explain select * from t2 where t2.a in (select t1.a from t1,t3 where t1.b=t3.a);
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 PRIMARY t2 index NULL PRIMARY 4 NULL 4 Using where; Using index
|
||
2 DEPENDENT SUBQUERY t1 eq_ref PRIMARY PRIMARY 4 func 1 Using where
|
||
2 DEPENDENT SUBQUERY t3 eq_ref PRIMARY PRIMARY 4 test.t1.b 1 Using where; Using index
|
||
drop table t1, t2, t3;
|
||
create table t1 (a int, b int, index a (a,b));
|
||
create table t2 (a int, index a (a));
|
||
create table t3 (a int, b int, index a (a));
|
||
insert into t1 values (1,10), (2,20), (3,30), (4,40);
|
||
insert into t2 values (2), (3), (4), (5);
|
||
insert into t3 values (10,3), (20,4), (30,5);
|
||
select * from t2 where t2.a in (select a from t1);
|
||
a
|
||
2
|
||
3
|
||
4
|
||
explain select * from t2 where t2.a in (select a from t1);
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 PRIMARY t2 index NULL a 5 NULL 4 Using where; Using index
|
||
2 DEPENDENT SUBQUERY t1 index_in a a 5 func 1001 Using index
|
||
select * from t2 where t2.a in (select a from t1 where t1.b <> 30);
|
||
a
|
||
2
|
||
4
|
||
explain select * from t2 where t2.a in (select a from t1 where t1.b <> 30);
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 PRIMARY t2 index NULL a 5 NULL 4 Using where; Using index
|
||
2 DEPENDENT SUBQUERY t1 index_in a a 5 func 1001 Using index; Using where
|
||
select * from t2 where t2.a in (select t1.a from t1,t3 where t1.b=t3.a);
|
||
a
|
||
2
|
||
3
|
||
explain select * from t2 where t2.a in (select t1.a from t1,t3 where t1.b=t3.a);
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 PRIMARY t2 index NULL a 5 NULL 4 Using where; Using index
|
||
2 DEPENDENT SUBQUERY t3 index a a 5 NULL 3 Using index
|
||
2 DEPENDENT SUBQUERY t1 ref a a 10 func,test.t3.a 1000 Using where; Using index
|
||
insert into t1 values (3,31);
|
||
select * from t2 where t2.a in (select a from t1 where t1.b <> 30);
|
||
a
|
||
2
|
||
3
|
||
4
|
||
select * from t2 where t2.a in (select a from t1 where t1.b <> 30 and t1.b <> 31);
|
||
a
|
||
2
|
||
4
|
||
explain select * from t2 where t2.a in (select a from t1 where t1.b <> 30);
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 PRIMARY t2 index NULL a 5 NULL 4 Using where; Using index
|
||
2 DEPENDENT SUBQUERY t1 index_in a a 5 func 1001 Using index; Using where
|
||
drop table t1, t2, t3;
|
||
create table t1 (a int, b int);
|
||
create table t2 (a int, b int);
|
||
create table t3 (a int, b int);
|
||
insert into t1 values (0,100),(1,2), (1,3), (2,2), (2,7), (2,-1), (3,10);
|
||
insert into t2 values (0,0), (1,1), (2,1), (3,1), (4,1);
|
||
insert into t3 values (3,3), (2,2), (1,1);
|
||
select a,(select count(distinct t1.b) as sum from t1,t2 where t1.a=t2.a and t2.b > 0 and t1.a <= t3.b group by t1.a order by sum limit 1) from t3;
|
||
a (select count(distinct t1.b) as sum from t1,t2 where t1.a=t2.a and t2.b > 0 and t1.a <= t3.b group by t1.a order by sum limit 1)
|
||
3 1
|
||
2 2
|
||
1 2
|
||
drop table t1,t2,t3;
|
||
create table t1 (s1 int);
|
||
create table t2 (s1 int);
|
||
insert into t1 values (1);
|
||
insert into t2 values (1);
|
||
select * from t1 where exists (select s1 from t2 having max(t2.s1)=t1.s1);
|
||
s1
|
||
drop table t1,t2;
|
||
create table t1 (s1 int);
|
||
create table t2 (s1 int);
|
||
insert into t1 values (1);
|
||
insert into t2 values (1);
|
||
update t1 set s1 = s1 + 1 where 1 = (select x.s1 as A from t2 WHERE t2.s1 > t1.s1 order by A);
|
||
ERROR 42S02: Unknown table 'x' in field list
|
||
DROP TABLE t1, t2;
|
||
create table t1 (a int) type=innodb;
|
||
create table t2 (a int) type=innodb;
|
||
create table t3 (a int) type=innodb;
|
||
insert into t1 values (1),(2),(3),(4);
|
||
insert into t2 values (10),(20),(30),(40);
|
||
insert into t3 values (1),(2),(10),(50);
|
||
select a from t3 where t3.a in (select a from t1 where a <= 3 union select * from t2 where a <= 30);
|
||
a
|
||
1
|
||
2
|
||
10
|
||
drop table t1,t2;
|
||
CREATE TABLE t1 (s1 CHAR(5) COLLATE latin1_german1_ci,
|
||
s2 CHAR(5) COLLATE latin1_swedish_ci);
|
||
INSERT INTO t1 VALUES ('z','?');
|
||
select * from t1 where s1 > (select max(s2) from t1);
|
||
ERROR HY000: Illegal mix of collations (latin1_german1_ci,IMPLICIT) and (latin1_swedish_ci,IMPLICIT) for operation '>'
|
||
select * from t1 where s1 > any (select max(s2) from t1);
|
||
ERROR HY000: Illegal mix of collations (latin1_german1_ci,IMPLICIT) and (latin1_swedish_ci,IMPLICIT) for operation '>'
|
||
drop table t1;
|
||
create table t1(toid int,rd int);
|
||
create table t2(userid int,pmnew int,pmtotal int);
|
||
insert into t2 values(1,0,0),(2,0,0);
|
||
insert into t1 values(1,0),(1,0),(1,0),(1,12),(1,15),(1,123),(1,12312),(1,12312),(1,123),(2,0),(2,0),(2,1),(2,2);
|
||
select userid,pmtotal,pmnew, (select count(rd) from t1 where toid=t2.userid) calc_total, (select count(rd) from t1 where rd=0 and toid=t2.userid) calc_new from t2 where userid in (select distinct toid from t1);
|
||
userid pmtotal pmnew calc_total calc_new
|
||
1 0 0 9 3
|
||
2 0 0 4 2
|
||
drop table t1, t2;
|
||
create table t1 (s1 char(5));
|
||
select (select 'a','b' from t1 union select 'a','b' from t1) from t1;
|
||
ERROR 21000: Cardinality error (more/less than 1 columns)
|
||
insert into t1 values ('tttt');
|
||
select * from t1 where ('a','b')=(select 'a','b' from t1 union select 'a','b' from t1);
|
||
s1
|
||
tttt
|
||
explain (select * from t1);
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 SIMPLE t1 system NULL NULL NULL NULL 1
|
||
(select * from t1);
|
||
s1
|
||
tttt
|
||
drop table t1;
|
||
create table t1 (s1 char(5), index s1(s1));
|
||
create table t2 (s1 char(5), index s1(s1));
|
||
insert into t1 values ('a1'),('a2'),('a3');
|
||
insert into t2 values ('a1'),('a2');
|
||
select s1, s1 NOT IN (SELECT s1 FROM t2) from t1;
|
||
s1 s1 NOT IN (SELECT s1 FROM t2)
|
||
a1 0
|
||
a2 0
|
||
a3 1
|
||
select s1, s1 NOT IN (SELECT s1 FROM t2 WHERE s1 < 'a2') from t1;
|
||
s1 s1 NOT IN (SELECT s1 FROM t2 WHERE s1 < 'a2')
|
||
a1 0
|
||
a2 1
|
||
a3 1
|
||
explain select s1, s1 NOT IN (SELECT s1 FROM t2) from t1;
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 PRIMARY t1 index NULL s1 6 NULL 3 Using index
|
||
2 DEPENDENT SUBQUERY t2 index_in s1 s1 6 func 2 Using index
|
||
explain select s1, s1 NOT IN (SELECT s1 FROM t2 WHERE s1 < 'a2') from t1;
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 PRIMARY t1 index NULL s1 6 NULL 3 Using index
|
||
2 DEPENDENT SUBQUERY t2 index_in s1 s1 6 func 1 Using index; Using where
|
||
drop table t1,t2;
|