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359846f052
Set min value of max_allowed_packet to 1024 Fixed problem with UNION's without braces and SQL_CALC_FOUND_ROWS, LIMIT #,# and ORDER BY...LIMIT
423 lines
10 KiB
Plaintext
423 lines
10 KiB
Plaintext
drop table if exists t1,t2,t3,t4,t5,t6;
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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 a,b from t1 union select a,b from t2;
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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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4 d
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5 f
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6 e
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select a,b from t1 union all select a,b from t2;
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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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3 c
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4 d
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5 f
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6 e
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select a,b from t1 union all select a,b from t2 order by b;
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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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3 c
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4 d
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6 e
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5 f
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select a,b from t1 union all select a,b from t2 union select 7,'g';
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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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3 c
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4 d
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5 f
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6 e
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7 g
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select 0,'#' union select a,b from t1 union all select a,b from t2 union select 7,'gg';
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0 #
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0 #
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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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3 c
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4 d
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5 f
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6 e
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7 g
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select a,b from t1 union select a,b from t1;
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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 't1',b,count(*) from t1 group by b UNION select 't2',b,count(*) from t2 group by b;
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t1 b count(*)
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t1 a 1
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t1 b 1
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t1 c 2
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t2 c 1
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t2 d 1
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t2 e 1
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t2 f 1
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(select a,b from t1 limit 2) union all (select a,b from t2 order by a) limit 4;
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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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4 d
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(select a,b from t1 limit 2) union all (select a,b from t2 order by a limit 1);
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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 a,b from t1 limit 2) union all (select a,b from t2 order by a limit 1) order by b desc;
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a b
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3 c
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2 b
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1 a
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explain (select a,b from t1 limit 2) union all (select a,b from t2 order by a limit 1) order by b desc;
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table type possible_keys key key_len ref rows Extra
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t1 ALL NULL NULL NULL NULL 4
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t2 ALL NULL NULL NULL NULL 4 Using filesort
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t1 ALL NULL NULL NULL NULL 4
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(select sql_calc_found_rows a,b from t1 limit 2) union all (select a,b from t2 order by a) limit 2;
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a b
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1 a
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2 b
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select found_rows();
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found_rows()
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6
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select sql_calc_found_rows a,b from t1 union all select a,b from t2 limit 2;
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a b
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1 a
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2 b
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select found_rows();
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found_rows()
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8
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explain select a,b from t1 union all select a,b from t2;
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table type possible_keys key key_len ref rows Extra
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t1 ALL NULL NULL NULL NULL 4
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t2 ALL NULL NULL NULL NULL 4
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explain select xx from t1 union select 1;
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Unknown column 'xx' in 'field list'
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explain select a,b from t1 union select 1;
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table type possible_keys key key_len ref rows Extra
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t1 ALL NULL NULL NULL NULL 4
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0 0 No tables used
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explain select 1 union select a,b from t1 union select 1;
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table type possible_keys key key_len ref rows Extra
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0 0 No tables used
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t1 ALL NULL NULL NULL NULL 4
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0 0 No tables used
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explain select a,b from t1 union select 1 limit 0;
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table type possible_keys key key_len ref rows Extra
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t1 ALL NULL NULL NULL NULL 4
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0 0 Impossible WHERE
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select a,b from t1 into outfile 'skr' union select a,b from t2;
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Wrong usage of UNION and INTO
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select a,b from t1 order by a union select a,b from t2;
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Wrong usage of UNION and ORDER BY
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insert into t3 select a from t1 order by a union select a from t2;
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Wrong usage of UNION and ORDER BY
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create table t3 select a,b from t1 union select a from t2;
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The used SELECT statements have a different number of columns
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select a,b from t1 union select a from t2;
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The used SELECT statements have a different number of columns
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select * from t1 union select a from t2;
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The used SELECT statements have a different number of columns
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select a from t1 union select * from t2;
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The used SELECT statements have a different number of columns
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select * from t1 union select SQL_BUFFER_RESULT * from t2;
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Wrong usage/placement of 'SQL_BUFFER_RESULT'
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create table t3 select a,b from t1 union all select a,b from t2;
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insert into t3 select a,b from t1 union all select a,b from t2;
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replace into t3 select a,b as c from t1 union all select a,b from t2;
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drop table t1,t2,t3;
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CREATE TABLE t1 (
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`pseudo` char(35) NOT NULL default '',
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`pseudo1` char(35) NOT NULL default '',
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`same` tinyint(1) unsigned NOT NULL default '1',
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PRIMARY KEY (`pseudo1`),
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KEY `pseudo` (`pseudo`)
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) TYPE=MyISAM;
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INSERT INTO t1 (pseudo,pseudo1,same) VALUES ('joce', 'testtt', 1),('joce', 'tsestset', 1),('dekad', 'joce', 1);
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SELECT pseudo FROM t1 WHERE pseudo1='joce' UNION SELECT pseudo FROM t1 WHERE pseudo='joce';
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pseudo
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dekad
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joce
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SELECT pseudo1 FROM t1 WHERE pseudo1='joce' UNION SELECT pseudo1 FROM t1 WHERE pseudo='joce';
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pseudo1
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joce
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testtt
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tsestset
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SELECT * FROM t1 WHERE pseudo1='joce' UNION SELECT * FROM t1 WHERE pseudo='joce' order by pseudo desc,pseudo1 desc;
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pseudo pseudo1 same
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joce tsestset 1
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joce testtt 1
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dekad joce 1
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SELECT pseudo1 FROM t1 WHERE pseudo='joce' UNION SELECT pseudo FROM t1 WHERE pseudo1='joce';
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pseudo1
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testtt
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tsestset
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dekad
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SELECT pseudo1 FROM t1 WHERE pseudo='joce' UNION ALL SELECT pseudo FROM t1 WHERE pseudo1='joce';
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pseudo1
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testtt
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tsestset
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dekad
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SELECT pseudo1 FROM t1 WHERE pseudo='joce' UNION SELECT 1;
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pseudo1
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testtt
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tsestset
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1
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drop table t1;
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drop table if exists t1,t2;
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create table t1 (a int);
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create table t2 (a int);
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insert into t1 values (1),(2),(3),(4),(5);
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insert into t2 values (11),(12),(13),(14),(15);
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(select * from t1 limit 2) union (select * from t2 limit 3) limit 4;
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a
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1
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2
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11
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12
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(select * from t1 limit 2) union (select * from t2 limit 3);
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a
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1
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2
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11
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12
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13
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(select * from t1 limit 2) union (select * from t2 limit 20,3);
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a
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1
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2
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set SQL_SELECT_LIMIT=2;
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(select * from t1 limit 1) union (select * from t2 limit 3);
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a
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1
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11
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set SQL_SELECT_LIMIT=DEFAULT;
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drop table t1,t2;
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CREATE TABLE t1 (
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cid smallint(5) unsigned NOT NULL default '0',
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cv varchar(250) NOT NULL default '',
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PRIMARY KEY (cid),
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UNIQUE KEY cv (cv)
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) ;
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INSERT INTO t1 VALUES (8,'dummy');
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CREATE TABLE t2 (
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cid bigint(20) unsigned NOT NULL auto_increment,
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cap varchar(255) NOT NULL default '',
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PRIMARY KEY (cid),
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KEY cap (cap)
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) ;
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CREATE TABLE t3 (
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gid bigint(20) unsigned NOT NULL auto_increment,
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gn varchar(255) NOT NULL default '',
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must tinyint(4) default NULL,
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PRIMARY KEY (gid),
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KEY gn (gn)
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) ;
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INSERT INTO t3 VALUES (1,'V1',NULL);
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CREATE TABLE t4 (
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uid bigint(20) unsigned NOT NULL default '0',
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gid bigint(20) unsigned default NULL,
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rid bigint(20) unsigned default NULL,
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cid bigint(20) unsigned default NULL,
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UNIQUE KEY m (uid,gid,rid,cid),
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KEY uid (uid),
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KEY rid (rid),
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KEY cid (cid),
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KEY container (gid,rid,cid)
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) ;
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INSERT INTO t4 VALUES (1,1,NULL,NULL);
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CREATE TABLE t5 (
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rid bigint(20) unsigned NOT NULL auto_increment,
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rl varchar(255) NOT NULL default '',
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PRIMARY KEY (rid),
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KEY rl (rl)
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) ;
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CREATE TABLE t6 (
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uid bigint(20) unsigned NOT NULL auto_increment,
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un varchar(250) NOT NULL default '',
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uc smallint(5) unsigned NOT NULL default '0',
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PRIMARY KEY (uid),
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UNIQUE KEY nc (un,uc),
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KEY un (un)
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) ;
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INSERT INTO t6 VALUES (1,'test',8);
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SELECT t4.uid, t5.rl, t3.gn as g1, t4.cid, t4.gid as gg FROM t3, t6, t1, t4 left join t5 on t5.rid = t4.rid left join t2 on t2.cid = t4.cid WHERE t3.gid=t4.gid AND t6.uid = t4.uid AND t6.uc = t1.cid AND t1.cv = "dummy" AND t6.un = "test";
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uid rl g1 cid gg
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1 NULL V1 NULL 1
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SELECT t4.uid, t5.rl, t3.gn as g1, t4.cid, t4.gid as gg FROM t3, t6, t1, t4 left join t5 on t5.rid = t4.rid left join t2 on t2.cid = t4.cid WHERE t3.gid=t4.gid AND t6.uid = t4.uid AND t3.must IS NOT NULL AND t6.uc = t1.cid AND t1.cv = "dummy" AND t6.un = "test";
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uid rl g1 cid gg
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(SELECT t4.uid, t5.rl, t3.gn as g1, t4.cid, t4.gid as gg FROM t3, t6, t1, t4 left join t5 on t5.rid = t4.rid left join t2 on t2.cid = t4.cid WHERE t3.gid=t4.gid AND t6.uid = t4.uid AND t3.must IS NOT NULL AND t6.uc = t1.cid AND t1.cv = "dummy" AND t6.un = "test") UNION (SELECT t4.uid, t5.rl, t3.gn as g1, t4.cid, t4.gid as gg FROM t3, t6, t1, t4 left join t5 on t5.rid = t4.rid left join t2 on t2.cid = t4.cid WHERE t3.gid=t4.gid AND t6.uid = t4.uid AND t6.uc = t1.cid AND t1.cv = "dummy" AND t6.un = "test");
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uid rl g1 cid gg
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1 NULL V1 NULL 1
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drop table t1,t2,t3,t4,t5,t6;
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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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create table t3 select a,b from t1 union select a,b from t2;
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create table t4 (select a,b from t1) union (select a,b from t2) limit 2;
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insert into t4 select a,b from t1 union select a,b from t2;
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insert into t3 (select a,b from t1) union (select a,b from t2) limit 2;
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select * from t3;
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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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4 d
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5 f
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6 e
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1 a
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2 b
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select * from t4;
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a b
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1 a
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2 b
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1 a
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2 b
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3 c
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4 d
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5 f
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6 e
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drop table t1,t2,t3,t4;
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create table t1 (a int);
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insert into t1 values (1),(2),(3);
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create table t2 (a int);
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insert into t2 values (3),(4),(5);
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(SELECT SQL_CALC_FOUND_ROWS * FROM t1) UNION all (SELECT * FROM t2) LIMIT 1;
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a
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1
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select found_rows();
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found_rows()
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6
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(SELECT SQL_CALC_FOUND_ROWS * FROM t1 LIMIT 1) UNION all (SELECT * FROM t2) LIMIT 2;
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a
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1
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3
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select found_rows();
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found_rows()
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4
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(SELECT SQL_CALC_FOUND_ROWS * FROM t1 LIMIT 1) UNION all (SELECT * FROM t2);
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a
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1
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3
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4
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5
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select found_rows();
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found_rows()
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4
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(SELECT SQL_CALC_FOUND_ROWS * FROM t1) UNION all (SELECT * FROM t2 LIMIT 1);
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a
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1
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2
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3
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3
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select found_rows();
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found_rows()
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4
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(SELECT SQL_CALC_FOUND_ROWS * FROM t1 LIMIT 1) UNION SELECT * FROM t2 LIMIT 1;
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a
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1
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select found_rows();
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found_rows()
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4
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SELECT SQL_CALC_FOUND_ROWS * FROM t1 LIMIT 1 UNION all SELECT * FROM t2 LIMIT 2;
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a
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1
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3
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select found_rows();
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found_rows()
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6
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SELECT SQL_CALC_FOUND_ROWS * FROM t1 UNION all SELECT * FROM t2 LIMIT 2;
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a
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1
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2
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select found_rows();
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found_rows()
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6
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SELECT SQL_CALC_FOUND_ROWS * FROM t1 UNION SELECT * FROM t2 LIMIT 2;
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a
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1
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2
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select found_rows();
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found_rows()
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6
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SELECT SQL_CALC_FOUND_ROWS * FROM t1 UNION SELECT * FROM t2 LIMIT 100;
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a
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1
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2
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3
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4
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5
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select found_rows();
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found_rows()
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6
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SELECT SQL_CALC_FOUND_ROWS * FROM t1 LIMIT 100 UNION SELECT * FROM t2;
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a
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1
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2
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3
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4
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5
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select found_rows();
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found_rows()
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5
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SELECT SQL_CALC_FOUND_ROWS * FROM t1 LIMIT 1 UNION SELECT * FROM t2;
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a
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1
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3
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4
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5
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select found_rows();
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found_rows()
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6
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SELECT SQL_CALC_FOUND_ROWS * FROM t1 LIMIT 1 UNION SELECT * FROM t2 LIMIT 2;
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a
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1
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3
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select found_rows();
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found_rows()
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6
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SELECT SQL_CALC_FOUND_ROWS * FROM t1 UNION SELECT * FROM t2 LIMIT 2,2;
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a
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3
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4
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select found_rows();
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found_rows()
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6
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SELECT SQL_CALC_FOUND_ROWS * FROM t1 limit 2,2 UNION SELECT * FROM t2;
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a
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3
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4
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5
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select found_rows();
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found_rows()
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5
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SELECT * FROM t1 UNION SELECT * FROM t2 ORDER BY a desc LIMIT 1;
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a
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5
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(SELECT * FROM t1 ORDER by a) UNION ALL (SELECT * FROM t2 ORDER BY a) ORDER BY A desc LIMIT 4;
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a
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5
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4
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3
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3
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(SELECT * FROM t1) UNION all (SELECT SQL_CALC_FOUND_ROWS * FROM t2) LIMIT 1;
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Wrong usage/placement of 'SQL_CALC_FOUND_ROWS'
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drop table t1,t2;
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