mirror of
https://github.com/MariaDB/server.git
synced 2025-01-19 13:32:33 +01:00
0c5b323d0f
merging with switching on static tables optimization (SCRUM) fixed subselects with uncacheable results added test for fixed bugs from bugreports
953 lines
33 KiB
Text
953 lines
33 KiB
Text
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 1247 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 1247 Select 2 was reduced during optimisation
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Note 1247 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 SUBSELECT 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 1247 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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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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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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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 SUBSELECT 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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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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Unknown column 'a' in 'field list'
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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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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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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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Wrong usage of PROCEDURE and subquery
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SELECT 1 FROM (SELECT 1) a PROCEDURE ANALYSE((SELECT 1));
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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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Cardinality error (more/less than 1 columns)
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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, b int);
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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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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 SUBSELECT 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 SUBSELECT 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 SUBSELECT 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 SUBSELECT t2 ALL NULL NULL NULL NULL 2
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3 DEPENDENT SUBSELECT t3 ALL NULL NULL NULL NULL 3 Using where
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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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Cardinality error (more/less than 1 columns)
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select * from t3 where a in (select * from t2);
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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);
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select b,max(a) as ma from t4 group by b having b < (select max(t2.a)
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from t2 where t2.b=t4.b);
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b ma
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select b,max(a) as ma from t4 group by b having b >= (select max(t2.a)
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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 SUBSELECT 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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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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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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select * from t1 where a= (select a from t2,t4 where t2.b=t4.b);
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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 SUBSELECT t8 const PRIMARY PRIMARY 35 1
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2 SUBSELECT t8 const PRIMARY PRIMARY 35 const 1
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3 SUBSELECT 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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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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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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Subselect returns more than 1 record
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drop table if exists t1,t2,t3,t4,t5,t6,t7,t8;
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CREATE TABLE `t1` (
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`topic` mediumint(8) unsigned NOT NULL default '0',
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`date` date NOT NULL default '0000-00-00',
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`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`)
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) 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');
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EXPLAIN SELECT DISTINCT date FROM t1 WHERE date='2002-08-03';
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 index NULL PRIMARY 41 NULL 2 Using where; Using index
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EXPLAIN SELECT (SELECT DISTINCT date FROM t1 WHERE date='2002-08-03');
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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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2 SUBSELECT t1 index NULL PRIMARY 41 NULL 2 Using where; Using index
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SELECT DISTINCT date FROM t1 WHERE date='2002-08-03';
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date
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2002-08-03
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SELECT (SELECT DISTINCT date FROM t1 WHERE date='2002-08-03');
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(SELECT DISTINCT date FROM t1 WHERE date='2002-08-03')
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2002-08-03
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SELECT 1 FROM t1 WHERE 1=(SELECT 1 UNION SELECT 1) UNION ALL SELECT 1;
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1
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1
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1
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1
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SELECT 1 FROM t1 WHERE 1=(SELECT 1 UNION ALL SELECT 1) UNION SELECT 1;
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Subselect returns more than 1 record
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EXPLAIN SELECT 1 FROM t1 WHERE 1=(SELECT 1 UNION SELECT 1);
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id select_type table type possible_keys key key_len ref rows Extra
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1 PRIMARY t1 index NULL topic 3 NULL 2 Using index
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2 SUBSELECT 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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drop table t1;
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CREATE TABLE `t1` (
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`numeropost` mediumint(8) unsigned NOT NULL auto_increment,
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`maxnumrep` int(10) unsigned NOT NULL default '0',
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PRIMARY KEY (`numeropost`),
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UNIQUE KEY `maxnumrep` (`maxnumrep`)
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) TYPE=MyISAM ROW_FORMAT=FIXED;
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INSERT INTO t1 (numeropost,maxnumrep) VALUES (40143,1),(43506,2);
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CREATE TABLE `t2` (
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`mot` varchar(30) NOT NULL default '',
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`topic` mediumint(8) unsigned NOT NULL default '0',
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`date` date NOT NULL default '0000-00-00',
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`pseudo` varchar(35) NOT NULL default '',
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PRIMARY KEY (`mot`,`pseudo`,`date`,`topic`)
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) TYPE=MyISAM ROW_FORMAT=DYNAMIC;
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INSERT INTO t2 (mot,topic,date,pseudo) VALUES ('joce','40143','2002-10-22','joce'), ('joce','43506','2002-10-22','joce');
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select numeropost as a FROM t1 GROUP BY (SELECT 1 FROM t1 HAVING a=1);
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a
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40143
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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;
|
|
Unknown column 'a' in 'having clause'
|
|
SELECT 1 IN (SELECT 1 FROM t2 HAVING a);
|
|
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);
|
|
Subselect returns more than 1 record
|
|
select numeropost as a FROM t1 ORDER BY (SELECT 1 FROM t1 HAVING a=1);
|
|
Subselect returns more than 1 record
|
|
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');
|
|
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;
|
|
Reference 'numreponse' not supported (forward reference in item list)
|
|
SELECT numreponse, (SELECT numeropost FROM t1 HAVING numreponse=a) FROM (SELECT * FROM t1) as a;
|
|
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');
|
|
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 SUBSELECT 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);
|
|
You can't specify target table 't1' for update in FROM clause
|
|
update t1 set b= (select b from t2);
|
|
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);
|
|
You can't specify target table 't1' for update in FROM clause
|
|
delete from t1 where b = (select b from t2);
|
|
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);
|
|
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);
|
|
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 (a int);
|
|
insert into t2 values (1);
|
|
insert into t3 values (1),(2);
|
|
INSERT INTO t1 (x) VALUES ((SELECT x FROM t1));
|
|
You can't specify target table 't1' for update in FROM clause
|
|
INSERT INTO t1 (x) VALUES ((SELECT a FROM t3));
|
|
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;
|
|
You can't specify target table 't1' for update in FROM clause
|
|
INSERT DELAYED INTO t1 (x) VALUES ((SELECT SUM(x) FROM t2));
|
|
select * from t1;
|
|
x
|
|
1
|
|
2
|
|
3
|
|
3
|
|
0
|
|
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));
|
|
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));
|
|
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 *);
|
|
No tables used
|
|
CREATE TABLE t (id int(11) default NULL, KEY id (id)) TYPE=MyISAM CHARSET=latin1;
|
|
INSERT INTO t VALUES (1),(2);
|
|
SELECT * FROM t WHERE id IN (SELECT 1);
|
|
id
|
|
1
|
|
EXPLAIN SELECT * FROM t WHERE id IN (SELECT 1);
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
1 PRIMARY t ref id id 5 const 1 Using where; Using index
|
|
Warnings:
|
|
Note 1247 Select 2 was reduced during optimisation
|
|
SELECT * FROM t WHERE id IN (SELECT 1 UNION SELECT 3);
|
|
id
|
|
1
|
|
SELECT * FROM t WHERE id IN (SELECT 1+(select 1));
|
|
id
|
|
2
|
|
EXPLAIN SELECT * FROM t WHERE id IN (SELECT 1+(select 1));
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
1 PRIMARY t ref id id 5 const 1 Using where; Using index
|
|
3 SUBSELECT NULL NULL NULL NULL NULL NULL NULL No tables used
|
|
Warnings:
|
|
Note 1247 Select 3 was reduced during optimisation
|
|
Note 1247 Select 2 was reduced during optimisation
|
|
EXPLAIN SELECT * FROM t WHERE id IN (SELECT 1 UNION SELECT 3);
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
1 PRIMARY t index NULL id 5 NULL 2 Using where; Using index
|
|
2 DEPENDENT SUBSELECT 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 t WHERE id IN (SELECT 5 UNION SELECT 3);
|
|
id
|
|
SELECT * FROM t WHERE id IN (SELECT 5 UNION SELECT 2);
|
|
id
|
|
2
|
|
INSERT INTO t VALUES ((SELECT * FROM t));
|
|
You can't specify target table 't' for update in FROM clause
|
|
SELECT * FROM t;
|
|
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 t SET id=(SELECT * FROM t1);
|
|
Subselect returns more than 1 record
|
|
drop table t, t1;
|
|
create table t (a int);
|
|
insert into t values (1),(2),(3);
|
|
select 1 IN (SELECT * from t);
|
|
1 IN (SELECT * from t)
|
|
1
|
|
select 10 IN (SELECT * from t);
|
|
10 IN (SELECT * from t)
|
|
0
|
|
select NULL IN (SELECT * from t);
|
|
NULL IN (SELECT * from t)
|
|
NULL
|
|
update t set a=NULL where a=2;
|
|
select 1 IN (SELECT * from t);
|
|
1 IN (SELECT * from t)
|
|
1
|
|
select 3 IN (SELECT * from t);
|
|
3 IN (SELECT * from t)
|
|
1
|
|
select 10 IN (SELECT * from t);
|
|
10 IN (SELECT * from t)
|
|
NULL
|
|
select 1 > ALL (SELECT * from t);
|
|
1 > ALL (SELECT * from t)
|
|
0
|
|
select 10 > ALL (SELECT * from t);
|
|
10 > ALL (SELECT * from t)
|
|
NULL
|
|
select 1 > ANY (SELECT * from t);
|
|
1 > ANY (SELECT * from t)
|
|
NULL
|
|
select 10 > ANY (SELECT * from t);
|
|
10 > ANY (SELECT * from t)
|
|
1
|
|
drop table t;
|
|
create table t (a varchar(20));
|
|
insert into t values ('A'),('BC'),('DEF');
|
|
select 'A' IN (SELECT * from t);
|
|
'A' IN (SELECT * from t)
|
|
1
|
|
select 'XYZS' IN (SELECT * from t);
|
|
'XYZS' IN (SELECT * from t)
|
|
0
|
|
select NULL IN (SELECT * from t);
|
|
NULL IN (SELECT * from t)
|
|
NULL
|
|
update t set a=NULL where a='BC';
|
|
select 'A' IN (SELECT * from t);
|
|
'A' IN (SELECT * from t)
|
|
1
|
|
select 'DEF' IN (SELECT * from t);
|
|
'DEF' IN (SELECT * from t)
|
|
1
|
|
select 'XYZS' IN (SELECT * from t);
|
|
'XYZS' IN (SELECT * from t)
|
|
NULL
|
|
select 'A' > ALL (SELECT * from t);
|
|
'A' > ALL (SELECT * from t)
|
|
0
|
|
select 'XYZS' > ALL (SELECT * from t);
|
|
'XYZS' > ALL (SELECT * from t)
|
|
NULL
|
|
select 'A' > ANY (SELECT * from t);
|
|
'A' > ANY (SELECT * from t)
|
|
NULL
|
|
select 'XYZS' > ANY (SELECT * from t);
|
|
'XYZS' > ANY (SELECT * from t)
|
|
1
|
|
drop table t;
|
|
create table t (a float);
|
|
insert into t values (1.5),(2.5),(3.5);
|
|
select 1.5 IN (SELECT * from t);
|
|
1.5 IN (SELECT * from t)
|
|
1
|
|
select 10.5 IN (SELECT * from t);
|
|
10.5 IN (SELECT * from t)
|
|
0
|
|
select NULL IN (SELECT * from t);
|
|
NULL IN (SELECT * from t)
|
|
NULL
|
|
update t set a=NULL where a=2.5;
|
|
select 1.5 IN (SELECT * from t);
|
|
1.5 IN (SELECT * from t)
|
|
1
|
|
select 3.5 IN (SELECT * from t);
|
|
3.5 IN (SELECT * from t)
|
|
1
|
|
select 10.5 IN (SELECT * from t);
|
|
10.5 IN (SELECT * from t)
|
|
NULL
|
|
select 1.5 > ALL (SELECT * from t);
|
|
1.5 > ALL (SELECT * from t)
|
|
0
|
|
select 10.5 > ALL (SELECT * from t);
|
|
10.5 > ALL (SELECT * from t)
|
|
NULL
|
|
select 1.5 > ANY (SELECT * from t);
|
|
1.5 > ANY (SELECT * from t)
|
|
NULL
|
|
select 10.5 > ANY (SELECT * from t);
|
|
10.5 > ANY (SELECT * from t)
|
|
1
|
|
explain select (select a+1) from t;
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
1 PRIMARY t ALL NULL NULL NULL NULL 3
|
|
Warnings:
|
|
Note 1247 Select 2 was reduced during optimisation
|
|
select (select a+1) from t;
|
|
(select a+1)
|
|
2.5
|
|
NULL
|
|
4.5
|
|
drop table t;
|
|
create table t (a float);
|
|
select 10.5 IN (SELECT * from t LIMIT 1);
|
|
This version of MySQL doesn't yet support 'LIMIT & IN/ALL/ANY/SOME subquery'
|
|
select 10.5 IN (SELECT * from t LIMIT 1 UNION SELECT 1.5);
|
|
This version of MySQL doesn't yet support 'LIMIT & IN/ALL/ANY/SOME subquery'
|
|
drop table t;
|
|
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);
|
|
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);
|
|
Table 'test.t1' doesn't exist
|
|
set @a:=(SELECT a from t1);
|
|
Table 'test.t1' doesn't exist
|
|
CREATE TABLE t1 (a int, KEY(a));
|
|
HANDLER t1 OPEN;
|
|
HANDLER t1 READ a=((SELECT 1));
|
|
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));
|
|
Invalid use of group function
|
|
drop table t1;
|
|
CREATE TABLE t (a int(1));
|
|
EXPLAIN SELECT (SELECT RAND() FROM t) FROM t;
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
1 PRIMARY t system NULL NULL NULL NULL 0 const row not found
|
|
2 UNCACHEABLE SUBSELECT t system NULL NULL NULL NULL 0 const row not found
|
|
EXPLAIN SELECT (SELECT ENCRYPT('test') FROM t) FROM t;
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
1 PRIMARY t system NULL NULL NULL NULL 0 const row not found
|
|
2 UNCACHEABLE SUBSELECT t system NULL NULL NULL NULL 0 const row not found
|
|
EXPLAIN SELECT (SELECT BENCHMARK(1,1) FROM t) FROM t;
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
1 PRIMARY t system NULL NULL NULL NULL 0 const row not found
|
|
2 UNCACHEABLE SUBSELECT t system NULL NULL NULL NULL 0 const row not found
|
|
drop table t;
|
|
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');
|
|
INSERT INTO t2 VALUES ('joce','1','','joce'),('test','2','','test');
|
|
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;
|