mirror of
https://github.com/MariaDB/server.git
synced 2025-11-03 14:33:32 +03:00
23145cfed7
bmove_allign -> bmove_align Added OLAP function ROLLUP Split mysql_fix_privilege_tables to a script and a .sql data file Added new (MEMROOT*) functions to avoid calling current_thd() when creating some common objects. Added table_alias_charset, for easier --lower-case-table-name handling Better SQL_MODE handling (Setting complex options also sets sub options) New (faster) assembler string functions for x86
163 lines
4.6 KiB
Plaintext
163 lines
4.6 KiB
Plaintext
drop table if exists t1,t2,t3;
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select * from (select 2 from DUAL) b;
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2
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2
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SELECT 1 as a FROM (SELECT 1 UNION SELECT a) b;
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ERROR 42S22: Unknown column 'a' in 'field list'
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SELECT 1 as a FROM (SELECT a UNION SELECT 1) b;
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ERROR 42S22: Unknown column 'a' in 'field list'
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CREATE TABLE t1 (a int not null, b char (10) not null);
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insert into t1 values(1,'a'),(2,'b'),(3,'c'),(3,'c');
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CREATE TABLE t2 (a int not null, b char (10) not null);
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insert into t2 values (3,'c'),(4,'d'),(5,'f'),(6,'e');
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select t1.a,t3.y from t1,(select a as y from t2 where b='c') as t3 where t1.a = t3.y;
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a y
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3 3
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3 3
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select t1.a,t3.a from t1,(select * from t2 where b='c') as t3 where t1.a = t3.a;
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a a
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3 3
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3 3
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CREATE TABLE t3 (a int not null, b char (10) not null);
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insert into t3 values (3,'f'),(4,'y'),(5,'z'),(6,'c');
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select t1.a,t4.y from t1,(select t2.a as y from t2,(select t3.b from t3 where t3.a>3) as t5 where t2.b=t5.b) as t4 where t1.a = t4.y;
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a y
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3 3
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3 3
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SELECT a FROM (SELECT 1 FROM (SELECT 1) a HAVING a=1) b;
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ERROR 42S22: Unknown column 'a' in 'having clause'
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SELECT a,b as a FROM (SELECT '1' as a,'2' as b) b HAVING a=1;
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ERROR 23000: Column: 'a' in having clause is ambiguous
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SELECT a,2 as a FROM (SELECT '1' as a) b HAVING a=2;
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a a
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1 2
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SELECT a,2 as a FROM (SELECT '1' as a) b HAVING a=1;
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a a
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SELECT 1 FROM (SELECT 1) a WHERE a=2;
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ERROR 42S22: Unknown column 'a' in 'where clause'
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SELECT (SELECT 1) as a FROM (SELECT 1 FROM t1 HAVING a=1) as a;
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ERROR 42S22: Unknown column 'a' in 'having clause'
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select * from t1 as x1, (select * from t1) as x2;
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a b a b
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1 a 1 a
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2 b 1 a
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3 c 1 a
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3 c 1 a
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1 a 2 b
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2 b 2 b
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3 c 2 b
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3 c 2 b
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1 a 3 c
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2 b 3 c
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3 c 3 c
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3 c 3 c
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1 a 3 c
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2 b 3 c
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3 c 3 c
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3 c 3 c
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explain select * from t1 as x1, (select * from t1) as x2;
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id select_type table type possible_keys key key_len ref rows Extra
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1 PRIMARY x1 ALL NULL NULL NULL NULL 4
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1 PRIMARY <derived2> ALL NULL NULL NULL NULL 4
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2 DERIVED x1 ALL NULL NULL NULL NULL 4
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drop table if exists t2,t3;
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select * from (select 1) as a;
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1
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1
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select a from (select 1 as a) as b;
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a
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1
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select 1 from (select 1) as a;
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1
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1
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select * from (select * from t1 union select * from t1) a;
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a b
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1 a
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2 b
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3 c
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select * from (select * from t1 union all select * from t1) a;
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a b
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1 a
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2 b
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3 c
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3 c
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1 a
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2 b
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3 c
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3 c
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explain select * from (select * from t1 union select * from t1) a;
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id select_type table type possible_keys key key_len ref rows Extra
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1 PRIMARY <derived2> ALL NULL NULL NULL NULL 3
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2 DERIVED t1 ALL NULL NULL NULL NULL 4
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3 UNION t1 ALL NULL NULL NULL NULL 4
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explain select * from (select * from t1 union all select * from t1) a;
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id select_type table type possible_keys key key_len ref rows Extra
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1 PRIMARY <derived2> ALL NULL NULL NULL NULL 8
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2 DERIVED t1 ALL NULL NULL NULL NULL 4
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3 UNION t1 ALL NULL NULL NULL NULL 4
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CREATE TABLE t2 (a int not null);
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insert into t2 values(1);
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select * from (select * from t1 where t1.a=(select a from t2 where t2.a=t1.a)) a;
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a b
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1 a
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select * from (select * from t1 where t1.a=(select t2.a from t2 where t2.a=t1.a) union select t1.a, t1.b from t1) a;
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a b
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1 a
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2 b
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3 c
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explain select * from (select * from t1,t2 where t1.a=t2.a) t1;
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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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2 DERIVED t2 system NULL NULL NULL NULL 1
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2 DERIVED t1 ALL NULL NULL NULL NULL 4 Using where
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drop table t1, t2;
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create table t1(a int not null, t char(8), index(a));
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SELECT * FROM (SELECT * FROM t1) as b ORDER BY a ASC LIMIT 0,20;
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a t
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1 1
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2 2
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3 3
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4 4
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5 5
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6 6
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7 7
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8 8
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9 9
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10 10
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11 11
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12 12
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13 13
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14 14
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15 15
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16 16
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17 17
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18 18
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19 19
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20 20
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explain select count(*) from t1 as tt1, (select * from t1) as tt2;
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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 Select tables optimized away
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2 DERIVED tt1 index NULL a 4 NULL 10000 Using index
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drop table t1;
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SELECT * FROM (SELECT (SELECT * FROM (SELECT 1 as a) as a )) as b;
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(SELECT * FROM (SELECT 1 as a) as a )
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1
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select * from (select 1 as a) b left join (select 2 as a) c using(a);
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a a
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1 NULL
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SELECT * FROM (SELECT 1 UNION SELECT a) b;
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ERROR 42S22: Unknown column 'a' in 'field list'
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SELECT 1 as a FROM (SELECT a UNION SELECT 1) b;
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ERROR 42S22: Unknown column 'a' in 'field list'
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SELECT 1 as a FROM (SELECT 1 UNION SELECT a) b;
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ERROR 42S22: Unknown column 'a' in 'field list'
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select 1 from (select 2) a order by 0;
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ERROR 42S22: Unknown column '0' in 'order clause'
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create table t1 (id int);
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insert into t1 values (1),(2),(3);
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describe select * from (select * from t1 group by id) bar;
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id select_type table type possible_keys key key_len ref rows Extra
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1 PRIMARY <derived2> ALL NULL NULL NULL NULL 3
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2 DERIVED t1 ALL NULL NULL NULL NULL 3 Using temporary; Using filesort
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drop table t1;
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