655 lines
30 KiB
Plaintext
655 lines
30 KiB
Plaintext
set optimizer_switch='index_condition_pushdown=on';
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drop table if exists t1,t2;
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SET sql_mode = 'NO_ENGINE_SUBSTITUTION';
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create table t1 (a int, b int not null,unique key (a,b),index(b));
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insert ignore into t1 values (1,1),(2,2),(3,3),(4,4),(5,5),(6,6),(null,7),(9,9),(8,8),(7,7),(null,9),(null,9),(6,6);
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Warnings:
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Warning 1062 Duplicate entry '6-6' for key 'a'
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analyze table t1;
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Table Op Msg_type Msg_text
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test.t1 analyze status OK
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explain select * from t1 where a is null;
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id select_type table partitions type possible_keys key key_len ref rows filtered Extra
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1 SIMPLE t1 NULL ref a a 5 const 1 100.00 Using where; Using index
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Warnings:
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Note 1003 /* select#1 */ select `test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b` from `test`.`t1` where (`test`.`t1`.`a` is null)
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explain select * from t1 where a is null and b = 2;
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id select_type table partitions type possible_keys key key_len ref rows filtered Extra
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1 SIMPLE t1 NULL ref a,b a 9 const,const 1 100.00 Using where; Using index
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Warnings:
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Note 1003 /* select#1 */ select `test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b` from `test`.`t1` where ((`test`.`t1`.`b` = 2) and (`test`.`t1`.`a` is null))
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explain select * from t1 where a is null and b = 7;
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id select_type table partitions type possible_keys key key_len ref rows filtered Extra
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1 SIMPLE t1 NULL ref a,b a 9 const,const 1 100.00 Using where; Using index
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Warnings:
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Note 1003 /* select#1 */ select `test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b` from `test`.`t1` where ((`test`.`t1`.`b` = 7) and (`test`.`t1`.`a` is null))
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explain select * from t1 where a=2 and b = 2;
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id select_type table partitions type possible_keys key key_len ref rows filtered Extra
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1 SIMPLE t1 NULL const a,b a 9 const,const 1 100.00 Using index
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Warnings:
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Note 1003 /* select#1 */ select '2' AS `a`,'2' AS `b` from `test`.`t1` where true
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explain select * from t1 where a<=>b limit 2;
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id select_type table partitions type possible_keys key key_len ref rows filtered Extra
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1 SIMPLE t1 NULL index NULL a 9 NULL 12 10.00 Using where; Using index
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Warnings:
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Note 1003 /* select#1 */ select `test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b` from `test`.`t1` where (`test`.`t1`.`a` <=> `test`.`t1`.`b`) limit 2
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explain select * from t1 where (a is null or a > 0 and a < 3) and b < 5 limit 3;
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id select_type table partitions type possible_keys key key_len ref rows filtered Extra
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1 SIMPLE t1 NULL range a,b a 9 NULL 2 100.00 Using where; Using index
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Warnings:
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Note 1003 /* select#1 */ select `test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b` from `test`.`t1` where (((`test`.`t1`.`a` is null) or ((`test`.`t1`.`a` > 0) and (`test`.`t1`.`a` < 3))) and (`test`.`t1`.`b` < 5)) limit 3
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explain format=tree select * from t1 where (a is null or a = 7) and b=7;
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EXPLAIN
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-> Filter: ((t1.a is null) or (t1.a = 7)) (cost=0.29 rows=0)
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-> Index lookup on t1 using b (b=7) (cost=0.29 rows=1)
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explain select * from t1 where (a is null or a = 7) and b=7;
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id select_type table partitions type possible_keys key key_len ref rows filtered Extra
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1 SIMPLE t1 NULL ref a,b b 4 const 1 40.00 Using where
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Warnings:
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Note 1003 /* select#1 */ select `test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b` from `test`.`t1` where ((`test`.`t1`.`b` = 7) and ((`test`.`t1`.`a` is null) or (`test`.`t1`.`a` = 7)))
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explain select * from t1 where (a is null or a = 7) and b=7 order by a;
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id select_type table partitions type possible_keys key key_len ref rows filtered Extra
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1 SIMPLE t1 NULL ref a,b b 4 const 1 40.00 Using where; Using filesort
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Warnings:
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Note 1003 /* select#1 */ select `test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b` from `test`.`t1` where ((`test`.`t1`.`b` = 7) and ((`test`.`t1`.`a` is null) or (`test`.`t1`.`a` = 7))) order by `test`.`t1`.`a`
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explain select * from t1 where (a is null and b>a) or a is null and b=7 limit 2;
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id select_type table partitions type possible_keys key key_len ref rows filtered Extra
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1 SIMPLE t1 NULL ref a,b a 5 const 1 44.44 Using where; Using index
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Warnings:
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Note 1003 /* select#1 */ select `test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b` from `test`.`t1` where (((`test`.`t1`.`a` is null) and (`test`.`t1`.`b` > `test`.`t1`.`a`)) or ((`test`.`t1`.`b` = 7) and (`test`.`t1`.`a` is null))) limit 2
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explain select * from t1 where a is null and b=9 or a is null and b=7 limit 3;
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id select_type table partitions type possible_keys key key_len ref rows filtered Extra
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1 SIMPLE t1 NULL range a,b a 9 NULL 2 100.00 Using where; Using index
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Warnings:
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Note 1003 /* select#1 */ select `test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b` from `test`.`t1` where (((`test`.`t1`.`b` = 9) and (`test`.`t1`.`a` is null)) or ((`test`.`t1`.`b` = 7) and (`test`.`t1`.`a` is null))) limit 3
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explain select * from t1 where a > 1 and a < 3 limit 1;
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id select_type table partitions type possible_keys key key_len ref rows filtered Extra
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1 SIMPLE t1 NULL range a a 5 NULL 1 100.00 Using where; Using index
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Warnings:
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Note 1003 /* select#1 */ select `test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b` from `test`.`t1` where ((`test`.`t1`.`a` > 1) and (`test`.`t1`.`a` < 3)) limit 1
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explain select * from t1 where a > 8 and a < 9;
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id select_type table partitions type possible_keys key key_len ref rows filtered Extra
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1 SIMPLE NULL NULL NULL NULL NULL NULL NULL NULL NULL no matching row in const table
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Warnings:
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Note 1003 /* select#1 */ select `test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b` from `test`.`t1` where ((`test`.`t1`.`a` > 8) and (`test`.`t1`.`a` < 9))
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select * from t1 where a is null;
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a b
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NULL 7
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NULL 9
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NULL 9
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select * from t1 where a is null and b = 7;
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a b
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NULL 7
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select * from t1 where a<=>b limit 2;
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a b
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1 1
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2 2
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select * from t1 where (a is null or a > 0 and a < 3) and b < 5 limit 3;
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a b
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1 1
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2 2
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select * from t1 where (a is null or a > 0 and a < 3) and b > 7 limit 3;
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a b
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NULL 9
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NULL 9
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select * from t1 where (a is null or a = 7) and b=7;
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a b
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NULL 7
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7 7
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select * from t1 where a is null and b=9 or a is null and b=7 limit 3;
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a b
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NULL 7
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NULL 9
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NULL 9
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select * from t1 where a > 1 and a < 3 limit 1;
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a b
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2 2
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select * from t1 where a > 8 and a < 9;
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a b
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create table t2 like t1;
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insert into t2 select * from t1;
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alter table t1
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modify b blob not null,
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add c int not null,
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drop key a,
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add unique key (a,b(20),c),
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drop key b,
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add key (b(10));
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analyze table t1, t2;
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Table Op Msg_type Msg_text
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test.t1 analyze status OK
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test.t2 analyze status OK
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explain select * from t1 where a is null and b = 2;
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id select_type table partitions type possible_keys key key_len ref rows filtered Extra
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1 SIMPLE t1 NULL ref a,b a 5 const 1 10.00 Using where
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Warnings:
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Warning 1739 Cannot use ref access on index 'b' due to type or collation conversion on field 'b'
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Warning 1739 Cannot use range access on index 'a' due to type or collation conversion on field 'b'
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Warning 1739 Cannot use range access on index 'b' due to type or collation conversion on field 'b'
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Note 1003 /* select#1 */ select `test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b`,`test`.`t1`.`c` AS `c` from `test`.`t1` where ((`test`.`t1`.`a` is null) and (`test`.`t1`.`b` = 2))
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explain select * from t1 where a is null and b = 2 and c=0;
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id select_type table partitions type possible_keys key key_len ref rows filtered Extra
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1 SIMPLE t1 NULL ref a,b a 5 const 1 8.33 Using where
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Warnings:
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Warning 1739 Cannot use ref access on index 'b' due to type or collation conversion on field 'b'
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Warning 1739 Cannot use range access on index 'a' due to type or collation conversion on field 'b'
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Warning 1739 Cannot use range access on index 'b' due to type or collation conversion on field 'b'
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Note 1003 /* select#1 */ select `test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b`,`test`.`t1`.`c` AS `c` from `test`.`t1` where ((`test`.`t1`.`c` = 0) and (`test`.`t1`.`a` is null) and (`test`.`t1`.`b` = 2))
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explain select * from t1 where a is null and b = 7 and c=0;
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id select_type table partitions type possible_keys key key_len ref rows filtered Extra
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1 SIMPLE t1 NULL ref a,b a 5 const 1 8.33 Using where
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Warnings:
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Warning 1739 Cannot use ref access on index 'b' due to type or collation conversion on field 'b'
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Warning 1739 Cannot use range access on index 'a' due to type or collation conversion on field 'b'
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Warning 1739 Cannot use range access on index 'b' due to type or collation conversion on field 'b'
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Note 1003 /* select#1 */ select `test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b`,`test`.`t1`.`c` AS `c` from `test`.`t1` where ((`test`.`t1`.`c` = 0) and (`test`.`t1`.`a` is null) and (`test`.`t1`.`b` = 7))
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explain select * from t1 where a=2 and b = 2;
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id select_type table partitions type possible_keys key key_len ref rows filtered Extra
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1 SIMPLE t1 NULL ref a,b a 5 const 1 10.00 Using where
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Warnings:
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Warning 1739 Cannot use ref access on index 'b' due to type or collation conversion on field 'b'
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Warning 1739 Cannot use range access on index 'a' due to type or collation conversion on field 'b'
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Warning 1739 Cannot use range access on index 'b' due to type or collation conversion on field 'b'
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Note 1003 /* select#1 */ select `test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b`,`test`.`t1`.`c` AS `c` from `test`.`t1` where ((`test`.`t1`.`a` = 2) and (`test`.`t1`.`b` = 2))
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explain select * from t1 where a<=>b limit 2;
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id select_type table partitions type possible_keys key key_len ref rows filtered Extra
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1 SIMPLE t1 NULL ALL NULL NULL NULL NULL 12 10.00 Using where
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Warnings:
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Note 1003 /* select#1 */ select `test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b`,`test`.`t1`.`c` AS `c` from `test`.`t1` where (`test`.`t1`.`a` <=> `test`.`t1`.`b`) limit 2
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explain select * from t1 where (a is null or a > 0 and a < 3) and b < 5 and c=0 limit 3;
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id select_type table partitions type possible_keys key key_len ref rows filtered Extra
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1 SIMPLE t1 NULL range a,b a 5 NULL 2 8.33 Using where
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Warnings:
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Warning 1739 Cannot use range access on index 'a' due to type or collation conversion on field 'b'
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Warning 1739 Cannot use range access on index 'b' due to type or collation conversion on field 'b'
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Note 1003 /* select#1 */ select `test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b`,`test`.`t1`.`c` AS `c` from `test`.`t1` where ((`test`.`t1`.`c` = 0) and ((`test`.`t1`.`a` is null) or ((`test`.`t1`.`a` > 0) and (`test`.`t1`.`a` < 3))) and (`test`.`t1`.`b` < 5)) limit 3
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explain select * from t1 where (a is null or a = 7) and b=7 and c=0;
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id select_type table partitions type possible_keys key key_len ref rows filtered Extra
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1 SIMPLE t1 NULL ref_or_null a,b a 5 const 2 8.33 Using where
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Warnings:
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Warning 1739 Cannot use ref access on index 'b' due to type or collation conversion on field 'b'
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Warning 1739 Cannot use range access on index 'a' due to type or collation conversion on field 'b'
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Warning 1739 Cannot use range access on index 'b' due to type or collation conversion on field 'b'
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Note 1003 /* select#1 */ select `test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b`,`test`.`t1`.`c` AS `c` from `test`.`t1` where ((`test`.`t1`.`c` = 0) and ((`test`.`t1`.`a` is null) or (`test`.`t1`.`a` = 7)) and (`test`.`t1`.`b` = 7))
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explain select * from t1 where (a is null and b>a) or a is null and b=7 limit 2;
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id select_type table partitions type possible_keys key key_len ref rows filtered Extra
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1 SIMPLE t1 NULL ref a,b a 5 const 1 40.00 Using where
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Warnings:
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Warning 1739 Cannot use ref access on index 'b' due to type or collation conversion on field 'b'
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Warning 1739 Cannot use range access on index 'a' due to type or collation conversion on field 'b'
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Warning 1739 Cannot use range access on index 'b' due to type or collation conversion on field 'b'
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Note 1003 /* select#1 */ select `test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b`,`test`.`t1`.`c` AS `c` from `test`.`t1` where (((`test`.`t1`.`a` is null) and (`test`.`t1`.`b` > `test`.`t1`.`a`)) or ((`test`.`t1`.`a` is null) and (`test`.`t1`.`b` = 7))) limit 2
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explain select * from t1 where a is null and b=9 or a is null and b=7 limit 3;
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id select_type table partitions type possible_keys key key_len ref rows filtered Extra
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1 SIMPLE t1 NULL ref a,b a 5 const 1 19.00 Using where
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Warnings:
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Warning 1739 Cannot use ref access on index 'b' due to type or collation conversion on field 'b'
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Warning 1739 Cannot use ref access on index 'b' due to type or collation conversion on field 'b'
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Warning 1739 Cannot use range access on index 'a' due to type or collation conversion on field 'b'
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Warning 1739 Cannot use range access on index 'b' due to type or collation conversion on field 'b'
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Warning 1739 Cannot use range access on index 'a' due to type or collation conversion on field 'b'
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Warning 1739 Cannot use range access on index 'b' due to type or collation conversion on field 'b'
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Note 1003 /* select#1 */ select `test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b`,`test`.`t1`.`c` AS `c` from `test`.`t1` where (((`test`.`t1`.`a` is null) and (`test`.`t1`.`b` = 9)) or ((`test`.`t1`.`a` is null) and (`test`.`t1`.`b` = 7))) limit 3
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explain select * from t1 where a > 1 and a < 3 limit 1;
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id select_type table partitions type possible_keys key key_len ref rows filtered Extra
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1 SIMPLE t1 NULL range a a 5 NULL 1 100.00 Using where
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Warnings:
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Note 1003 /* select#1 */ select `test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b`,`test`.`t1`.`c` AS `c` from `test`.`t1` where ((`test`.`t1`.`a` > 1) and (`test`.`t1`.`a` < 3)) limit 1
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explain select * from t1 where a is null and b=7 or a > 1 and a < 3 limit 1;
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id select_type table partitions type possible_keys key key_len ref rows filtered Extra
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1 SIMPLE t1 NULL range a,b a 5 NULL 2 100.00 Using where
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Warnings:
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Warning 1739 Cannot use ref access on index 'b' due to type or collation conversion on field 'b'
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Warning 1739 Cannot use range access on index 'a' due to type or collation conversion on field 'b'
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Warning 1739 Cannot use range access on index 'b' due to type or collation conversion on field 'b'
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Note 1003 /* select#1 */ select `test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b`,`test`.`t1`.`c` AS `c` from `test`.`t1` where (((`test`.`t1`.`a` is null) and (`test`.`t1`.`b` = 7)) or ((`test`.`t1`.`a` > 1) and (`test`.`t1`.`a` < 3))) limit 1
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explain select * from t1 where a > 8 and a < 9;
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id select_type table partitions type possible_keys key key_len ref rows filtered Extra
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1 SIMPLE NULL NULL NULL NULL NULL NULL NULL NULL NULL no matching row in const table
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Warnings:
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Note 1003 /* select#1 */ select `test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b`,`test`.`t1`.`c` AS `c` from `test`.`t1` where ((`test`.`t1`.`a` > 8) and (`test`.`t1`.`a` < 9))
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explain select * from t1 where b like "6%";
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id select_type table partitions type possible_keys key key_len ref rows filtered Extra
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1 SIMPLE t1 NULL range b b 12 NULL 1 100.00 Using where
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Warnings:
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Note 1003 /* select#1 */ select `test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b`,`test`.`t1`.`c` AS `c` from `test`.`t1` where (`test`.`t1`.`b` like '6%')
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select * from t1 where a is null;
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a b c
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NULL 7 0
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NULL 9 0
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NULL 9 0
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select * from t1 where a is null and b = 7 and c=0;
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a b c
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NULL 7 0
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select * from t1 where a<=>b limit 2;
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a b c
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1 1 0
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2 2 0
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select * from t1 where (a is null or a > 0 and a < 3) and b < 5 limit 3;
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a b c
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1 1 0
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2 2 0
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select * from t1 where (a is null or a > 0 and a < 3) and b > 7 limit 3;
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a b c
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NULL 9 0
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NULL 9 0
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select * from t1 where (a is null or a = 7) and b=7 and c=0;
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a b c
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7 7 0
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NULL 7 0
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select * from t1 where a is null and b=9 or a is null and b=7 limit 3;
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a b c
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NULL 7 0
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NULL 9 0
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NULL 9 0
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select * from t1 where b like "6%";
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a b c
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6 6 0
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drop table t1;
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rename table t2 to t1;
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alter table t1 modify b int null;
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insert into t1 values (7,null), (8,null), (8,7);
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analyze table t1;
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Table Op Msg_type Msg_text
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test.t1 analyze status OK
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explain select * from t1 where a = 7 and (b=7 or b is null);
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id select_type table partitions type possible_keys key key_len ref rows filtered Extra
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1 SIMPLE t1 NULL ref_or_null a,b a 10 const,const 2 100.00 Using where; Using index
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Warnings:
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Note 1003 /* select#1 */ select `test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b` from `test`.`t1` where ((`test`.`t1`.`a` = 7) and ((`test`.`t1`.`b` = 7) or (`test`.`t1`.`b` is null)))
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select * from t1 where a = 7 and (b=7 or b is null);
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a b
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7 7
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7 NULL
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explain select * from t1 where (a = 7 or a is null) and (b=7 or b is null);
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id select_type table partitions type possible_keys key key_len ref rows filtered Extra
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1 SIMPLE t1 NULL ref_or_null a,b b 5 const 2 22.00 Using index condition; Using where
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Warnings:
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Note 1003 /* select#1 */ select `test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b` from `test`.`t1` where (((`test`.`t1`.`a` = 7) or (`test`.`t1`.`a` is null)) and ((`test`.`t1`.`b` = 7) or (`test`.`t1`.`b` is null)))
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select * from t1 where (a = 7 or a is null) and (b=7 or b is null);
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a b
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NULL 7
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7 7
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7 NULL
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explain select * from t1 where (a = 7 or a is null) and (a = 7 or a is null);
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id select_type table partitions type possible_keys key key_len ref rows filtered Extra
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1 SIMPLE t1 NULL ref_or_null a a 5 const 2 100.00 Using where; Using index
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Warnings:
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Note 1003 /* select#1 */ select `test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b` from `test`.`t1` where (((`test`.`t1`.`a` = 7) or (`test`.`t1`.`a` is null)) and ((`test`.`t1`.`a` = 7) or (`test`.`t1`.`a` is null)))
|
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select * from t1 where (a = 7 or a is null) and (a = 7 or a is null);
|
|
a b
|
|
7 NULL
|
|
7 7
|
|
NULL 7
|
|
NULL 9
|
|
NULL 9
|
|
create table t2 (a int);
|
|
insert into t2 values (7),(8);
|
|
analyze table t2;
|
|
Table Op Msg_type Msg_text
|
|
test.t2 analyze status OK
|
|
explain select * from t2 straight_join t1 where t1.a=t2.a and b is null;
|
|
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
|
|
1 SIMPLE t2 NULL ALL NULL NULL NULL NULL 2 100.00 Using where
|
|
1 SIMPLE t1 NULL ref a,b a 10 test.t2.a,const 1 100.00 Using where; Using index
|
|
Warnings:
|
|
Note 1003 /* select#1 */ select `test`.`t2`.`a` AS `a`,`test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b` from `test`.`t2` straight_join `test`.`t1` where ((`test`.`t1`.`a` = `test`.`t2`.`a`) and (`test`.`t1`.`b` is null))
|
|
drop index b on t1;
|
|
analyze table t1;
|
|
Table Op Msg_type Msg_text
|
|
test.t1 analyze status OK
|
|
explain select * from t2,t1 where t1.a=t2.a and b is null;
|
|
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
|
|
1 SIMPLE t2 NULL ALL NULL NULL NULL NULL # 100.00 Using where
|
|
1 SIMPLE t1 NULL ref a a 10 test.t2.a,const # 100.00 Using where; Using index
|
|
Warnings:
|
|
Note 1003 /* select#1 */ select `test`.`t2`.`a` AS `a`,`test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b` from `test`.`t2` join `test`.`t1` where ((`test`.`t1`.`a` = `test`.`t2`.`a`) and (`test`.`t1`.`b` is null))
|
|
select * from t2,t1 where t1.a=t2.a and b is null;
|
|
a a b
|
|
7 7 NULL
|
|
8 8 NULL
|
|
explain select * from t2,t1 where t1.a=t2.a and (b= 7 or b is null);
|
|
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
|
|
1 SIMPLE t2 NULL ALL NULL NULL NULL NULL # 100.00 Using where
|
|
1 SIMPLE t1 NULL ref_or_null a a 10 test.t2.a,const # 100.00 Using where; Using index
|
|
Warnings:
|
|
Note 1003 /* select#1 */ select `test`.`t2`.`a` AS `a`,`test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b` from `test`.`t2` join `test`.`t1` where ((`test`.`t1`.`a` = `test`.`t2`.`a`) and ((`test`.`t1`.`b` = 7) or (`test`.`t1`.`b` is null)))
|
|
select * from t2,t1 where t1.a=t2.a and (b= 7 or b is null);
|
|
a a b
|
|
7 7 7
|
|
7 7 NULL
|
|
8 8 7
|
|
8 8 NULL
|
|
explain select * from t2,t1 where (t1.a=t2.a or t1.a is null) and b= 7;
|
|
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
|
|
1 SIMPLE t2 NULL ALL NULL NULL NULL NULL # 100.00 NULL
|
|
1 SIMPLE t1 NULL ref_or_null a a 10 test.t2.a,const # 100.00 Using where; Using index
|
|
Warnings:
|
|
Note 1003 /* select#1 */ select `test`.`t2`.`a` AS `a`,`test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b` from `test`.`t2` join `test`.`t1` where ((`test`.`t1`.`b` = 7) and ((`test`.`t1`.`a` = `test`.`t2`.`a`) or (`test`.`t1`.`a` is null)))
|
|
select * from t2,t1 where (t1.a=t2.a or t1.a is null) and b= 7;
|
|
a a b
|
|
7 7 7
|
|
7 NULL 7
|
|
8 8 7
|
|
8 NULL 7
|
|
explain select * from t2,t1 where (t1.a=t2.a or t1.a is null) and (b= 7 or b is null);
|
|
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
|
|
1 SIMPLE t2 NULL ALL NULL NULL NULL NULL # # NULL
|
|
1 SIMPLE t1 NULL ref_or_null a a 5 test.t2.a # # Using where; Using index
|
|
Warnings:
|
|
Note 1003 /* select#1 */ select `test`.`t2`.`a` AS `a`,`test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b` from `test`.`t2` join `test`.`t1` where (((`test`.`t1`.`a` = `test`.`t2`.`a`) or (`test`.`t1`.`a` is null)) and ((`test`.`t1`.`b` = 7) or (`test`.`t1`.`b` is null)))
|
|
select * from t2,t1 where (t1.a=t2.a or t1.a is null) and (b= 7 or b is null);
|
|
a a b
|
|
7 7 NULL
|
|
7 7 7
|
|
7 NULL 7
|
|
8 8 NULL
|
|
8 8 7
|
|
8 NULL 7
|
|
insert into t2 values (null),(6);
|
|
delete from t1 where a=8;
|
|
analyze table t1, t2;
|
|
Table Op Msg_type Msg_text
|
|
test.t1 analyze status OK
|
|
test.t2 analyze status OK
|
|
explain select * from t2,t1 where t1.a=t2.a or t1.a is null;
|
|
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
|
|
1 SIMPLE t2 NULL ALL NULL NULL NULL NULL # 100.00 NULL
|
|
1 SIMPLE t1 NULL ref_or_null a a 5 test.t2.a # 100.00 Using where; Using index
|
|
Warnings:
|
|
Note 1003 /* select#1 */ select `test`.`t2`.`a` AS `a`,`test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b` from `test`.`t2` join `test`.`t1` where ((`test`.`t1`.`a` = `test`.`t2`.`a`) or (`test`.`t1`.`a` is null))
|
|
explain select * from t2,t1 where t1.a<=>t2.a or (t1.a is null and t1.b <> 9);
|
|
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
|
|
1 SIMPLE t2 NULL ALL NULL NULL NULL NULL # 100.00 NULL
|
|
1 SIMPLE t1 NULL ref_or_null a a 5 test.t2.a # 100.00 Using where; Using index
|
|
Warnings:
|
|
Note 1003 /* select#1 */ select `test`.`t2`.`a` AS `a`,`test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b` from `test`.`t2` join `test`.`t1` where ((`test`.`t1`.`a` <=> `test`.`t2`.`a`) or ((`test`.`t1`.`a` is null) and (`test`.`t1`.`b` <> 9)))
|
|
select * from t2,t1 where t1.a<=>t2.a or (t1.a is null and t1.b <> 9);
|
|
a a b
|
|
7 7 NULL
|
|
7 7 7
|
|
7 NULL 7
|
|
8 NULL 7
|
|
NULL NULL 7
|
|
NULL NULL 9
|
|
NULL NULL 9
|
|
6 6 6
|
|
6 NULL 7
|
|
drop table t1,t2;
|
|
CREATE TABLE t1 (
|
|
id int(10) unsigned NOT NULL auto_increment,
|
|
uniq_id int(10) unsigned default NULL,
|
|
PRIMARY KEY (id),
|
|
UNIQUE KEY idx1 (uniq_id)
|
|
);
|
|
Warnings:
|
|
Warning 1681 Integer display width is deprecated and will be removed in a future release.
|
|
Warning 1681 Integer display width is deprecated and will be removed in a future release.
|
|
CREATE TABLE t2 (
|
|
id int(10) unsigned NOT NULL auto_increment,
|
|
uniq_id int(10) unsigned default NULL,
|
|
PRIMARY KEY (id)
|
|
);
|
|
Warnings:
|
|
Warning 1681 Integer display width is deprecated and will be removed in a future release.
|
|
Warning 1681 Integer display width is deprecated and will be removed in a future release.
|
|
INSERT INTO t1 VALUES (1,NULL),(2,NULL),(3,1),(4,2),(5,NULL),(6,NULL),(7,3),(8,4),(9,NULL),(10,NULL);
|
|
INSERT INTO t2 VALUES (1,NULL),(2,NULL),(3,1),(4,2),(5,NULL),(6,NULL),(7,3),(8,4),(9,NULL),(10,NULL);
|
|
ANALYZE TABLE t1, t2;
|
|
Table Op Msg_type Msg_text
|
|
test.t1 analyze status OK
|
|
test.t2 analyze status OK
|
|
explain select id from t1 where uniq_id is null;
|
|
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
|
|
1 SIMPLE t1 NULL ref idx1 idx1 5 const 1 100.00 Using index condition
|
|
Warnings:
|
|
Note 1003 /* select#1 */ select `test`.`t1`.`id` AS `id` from `test`.`t1` where (`test`.`t1`.`uniq_id` is null)
|
|
explain select id from t1 where uniq_id =1;
|
|
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
|
|
1 SIMPLE t1 NULL const idx1 idx1 5 const 1 100.00 NULL
|
|
Warnings:
|
|
Note 1003 /* select#1 */ select '3' AS `id` from `test`.`t1` where true
|
|
UPDATE t1 SET id=id+100 where uniq_id is null;
|
|
UPDATE t2 SET id=id+100 where uniq_id is null;
|
|
select id from t1 where uniq_id is null;
|
|
id
|
|
101
|
|
102
|
|
105
|
|
106
|
|
109
|
|
110
|
|
select id from t2 where uniq_id is null;
|
|
id
|
|
101
|
|
102
|
|
105
|
|
106
|
|
109
|
|
110
|
|
DELETE FROM t1 WHERE uniq_id IS NULL;
|
|
DELETE FROM t2 WHERE uniq_id IS NULL;
|
|
SELECT * FROM t1 ORDER BY uniq_id, id;
|
|
id uniq_id
|
|
3 1
|
|
4 2
|
|
7 3
|
|
8 4
|
|
SELECT * FROM t2 ORDER BY uniq_id, id;
|
|
id uniq_id
|
|
3 1
|
|
4 2
|
|
7 3
|
|
8 4
|
|
DROP table t1,t2;
|
|
CREATE TABLE `t1` (
|
|
`order_id` char(32) NOT NULL default '',
|
|
`product_id` char(32) NOT NULL default '',
|
|
`product_type` int(11) NOT NULL default '0',
|
|
PRIMARY KEY (`order_id`,`product_id`,`product_type`)
|
|
);
|
|
Warnings:
|
|
Warning 1681 Integer display width is deprecated and will be removed in a future release.
|
|
CREATE TABLE `t2` (
|
|
`order_id` char(32) NOT NULL default '',
|
|
`product_id` char(32) NOT NULL default '',
|
|
`product_type` int(11) NOT NULL default '0',
|
|
PRIMARY KEY (`order_id`,`product_id`,`product_type`)
|
|
);
|
|
Warnings:
|
|
Warning 1681 Integer display width is deprecated and will be removed in a future release.
|
|
INSERT INTO t1 (order_id, product_id, product_type) VALUES
|
|
('3d7ce39b5d4b3e3d22aaafe9b633de51',1206029, 3),
|
|
('3d7ce39b5d4b3e3d22aaafe9b633de51',5880836, 3),
|
|
('9d9aad7764b5b2c53004348ef8d34500',2315652, 3);
|
|
INSERT INTO t2 (order_id, product_id, product_type) VALUES
|
|
('9d9aad7764b5b2c53004348ef8d34500',2315652, 3);
|
|
select t1.* from t1
|
|
left join t2 using(order_id, product_id, product_type)
|
|
where t2.order_id=NULL;
|
|
order_id product_id product_type
|
|
select t1.* from t1
|
|
left join t2 using(order_id, product_id, product_type)
|
|
where t2.order_id is NULL;
|
|
order_id product_id product_type
|
|
3d7ce39b5d4b3e3d22aaafe9b633de51 1206029 3
|
|
3d7ce39b5d4b3e3d22aaafe9b633de51 5880836 3
|
|
drop table t1,t2;
|
|
create table t1 (id int);
|
|
insert into t1 values (null), (0);
|
|
create table t2 (id int);
|
|
insert into t2 values (null);
|
|
select * from t1, t2 where t1.id = t2.id;
|
|
id id
|
|
alter table t1 add key id (id);
|
|
select * from t1, t2 where t1.id = t2.id;
|
|
id id
|
|
drop table t1,t2;
|
|
create table t1 (
|
|
id integer,
|
|
id2 integer not null,
|
|
index (id),
|
|
index (id2)
|
|
);
|
|
insert into t1 values(null,null),(1,1);
|
|
Warnings:
|
|
Warning 1048 Column 'id2' cannot be null
|
|
select * from t1;
|
|
id id2
|
|
NULL 0
|
|
1 1
|
|
select * from t1 where id <=> null;
|
|
id id2
|
|
NULL 0
|
|
select * from t1 where id <=> null or id > 0;
|
|
id id2
|
|
NULL 0
|
|
1 1
|
|
select * from t1 where id is null or id > 0;
|
|
id id2
|
|
NULL 0
|
|
1 1
|
|
select * from t1 where id2 <=> null or id2 > 0;
|
|
id id2
|
|
1 1
|
|
select * from t1 where id2 is null or id2 > 0;
|
|
id id2
|
|
1 1
|
|
delete from t1 where id <=> NULL;
|
|
select * from t1;
|
|
id id2
|
|
1 1
|
|
drop table t1;
|
|
CREATE TABLE t1 (a int);
|
|
CREATE TABLE t2 (a int, b int, INDEX idx(a));
|
|
CREATE TABLE t3 (b int, INDEX idx(b));
|
|
CREATE TABLE t4 (b int, INDEX idx(b));
|
|
INSERT INTO t1 VALUES (1), (2), (3), (4);
|
|
INSERT INTO t2 VALUES (1, 1), (3, 1);
|
|
INSERT INTO t3 VALUES
|
|
(NULL), (NULL), (NULL), (NULL), (NULL),
|
|
(NULL), (NULL), (NULL), (NULL), (NULL);
|
|
INSERT INTO t4 SELECT * FROM t3;
|
|
INSERT INTO t3 SELECT * FROM t4;
|
|
INSERT INTO t4 SELECT * FROM t3;
|
|
INSERT INTO t3 SELECT * FROM t4;
|
|
INSERT INTO t4 SELECT * FROM t3;
|
|
INSERT INTO t3 SELECT * FROM t4;
|
|
INSERT INTO t4 SELECT * FROM t3;
|
|
INSERT INTO t3 SELECT * FROM t4;
|
|
INSERT INTO t4 SELECT * FROM t3;
|
|
INSERT INTO t3 SELECT * FROM t4;
|
|
INSERT INTO t4 SELECT * FROM t3;
|
|
INSERT INTO t3 SELECT * FROM t4;
|
|
INSERT INTO t4 SELECT * FROM t3;
|
|
INSERT INTO t3 SELECT * FROM t4;
|
|
INSERT INTO t4 SELECT * FROM t3;
|
|
INSERT INTO t3 SELECT * FROM t4;
|
|
INSERT INTO t3 VALUES (2), (3);
|
|
ANALYZE table t1, t2, t3;
|
|
Table Op Msg_type Msg_text
|
|
test.t1 analyze status OK
|
|
test.t2 analyze status OK
|
|
test.t3 analyze status OK
|
|
SELECT COUNT(*) FROM t3;
|
|
COUNT(*)
|
|
15972
|
|
EXPLAIN SELECT SQL_CALC_FOUND_ROWS * FROM t1 LEFT JOIN t2 ON t1.a=t2.a
|
|
LEFT JOIN t3 ON t2.b=t3.b;
|
|
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
|
|
1 SIMPLE t1 NULL ALL NULL NULL NULL NULL # 100.00 NULL
|
|
1 SIMPLE t2 NULL ref idx idx 5 test.t1.a # 100.00 NULL
|
|
1 SIMPLE t3 NULL ref idx idx 5 test.t2.b # 100.00 Using index
|
|
Warnings:
|
|
Warning 1287 SQL_CALC_FOUND_ROWS is deprecated and will be removed in a future release. Consider using two separate queries instead.
|
|
Note 1003 /* select#1 */ select sql_calc_found_rows `test`.`t1`.`a` AS `a`,`test`.`t2`.`a` AS `a`,`test`.`t2`.`b` AS `b`,`test`.`t3`.`b` AS `b` from `test`.`t1` left join `test`.`t2` on((`test`.`t2`.`a` = `test`.`t1`.`a`)) left join `test`.`t3` on((`test`.`t3`.`b` = `test`.`t2`.`b`)) where true
|
|
FLUSH STATUS ;
|
|
SELECT SQL_CALC_FOUND_ROWS * FROM t1 LEFT JOIN t2 ON t1.a=t2.a
|
|
LEFT JOIN t3 ON t2.b=t3.b;
|
|
a a b b
|
|
1 1 1 NULL
|
|
2 NULL NULL NULL
|
|
3 3 1 NULL
|
|
4 NULL NULL NULL
|
|
Warnings:
|
|
Warning 1287 SQL_CALC_FOUND_ROWS is deprecated and will be removed in a future release. Consider using two separate queries instead.
|
|
SELECT FOUND_ROWS();
|
|
FOUND_ROWS()
|
|
4
|
|
Warnings:
|
|
Warning 1287 FOUND_ROWS() is deprecated and will be removed in a future release. Consider using COUNT(*) instead.
|
|
SHOW STATUS LIKE "handler_read%";
|
|
Variable_name Value
|
|
Handler_read_first 0
|
|
Handler_read_key 6
|
|
Handler_read_last 0
|
|
Handler_read_next 2
|
|
Handler_read_prev 0
|
|
Handler_read_rnd 0
|
|
Handler_read_rnd_next 5
|
|
DROP TABLE t1,t2,t3,t4;
|
|
CREATE TABLE t1 (
|
|
a int(11) default NULL,
|
|
b int(11) default NULL,
|
|
KEY a (a,b)
|
|
);
|
|
Warnings:
|
|
Warning 1681 Integer display width is deprecated and will be removed in a future release.
|
|
Warning 1681 Integer display width is deprecated and will be removed in a future release.
|
|
INSERT INTO t1 VALUES (0,10),(0,11),(0,12);
|
|
CREATE TABLE t2 (
|
|
a int(11) default NULL,
|
|
b int(11) default NULL,
|
|
KEY a (a)
|
|
);
|
|
Warnings:
|
|
Warning 1681 Integer display width is deprecated and will be removed in a future release.
|
|
Warning 1681 Integer display width is deprecated and will be removed in a future release.
|
|
INSERT INTO t2 VALUES (3,NULL),(3,11),(3,12);
|
|
SELECT * FROM t2 inner join t1 WHERE ( t1.a = 0 OR t1.a IS NULL) AND t2.a = 3 AND t2.b = t1.b;
|
|
a b a b
|
|
3 11 0 11
|
|
3 12 0 12
|
|
drop table t1, t2;
|
|
End of 5.0 tests
|
|
#
|
|
# Bug#54608 Query using IN + OR + IS TRUE and IS NULL returns
|
|
# NULL when should be empty
|
|
#
|
|
CREATE TABLE t1 (a INT, KEY (a));
|
|
INSERT INTO t1 VALUES (1), (2), (NULL);
|
|
ANALYZE TABLE t1;
|
|
Table Op Msg_type Msg_text
|
|
test.t1 analyze status OK
|
|
explain SELECT a FROM t1 WHERE a IN (42) OR (a IS TRUE AND a IS NULL);
|
|
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
|
|
1 SIMPLE t1 NULL ref_or_null a a 5 const 2 100.00 Using where; Using index
|
|
Warnings:
|
|
Note 1003 /* select#1 */ select `test`.`t1`.`a` AS `a` from `test`.`t1` where ((`test`.`t1`.`a` = 42) or (((0 <> `test`.`t1`.`a`) is true) and (`test`.`t1`.`a` is null)))
|
|
SELECT a FROM t1 WHERE a IN (42) OR (a IS TRUE AND a IS NULL);
|
|
a
|
|
explain SELECT a FROM t1 WHERE a IN (42) OR (a=NULL);
|
|
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
|
|
1 SIMPLE t1 NULL ref_or_null a a 5 const # 100.00 Using where; Using index
|
|
Warnings:
|
|
Note 1003 /* select#1 */ select `test`.`t1`.`a` AS `a` from `test`.`t1` where ((`test`.`t1`.`a` = 42) or (`test`.`t1`.`a` = NULL))
|
|
SELECT a FROM t1 WHERE a IN (42) OR (a=NULL);
|
|
a
|
|
drop table t1;
|
|
SET sql_mode = default;
|
|
create table t1 (a int, b int not null,unique key (b,a),index(b));
|
|
insert ignore into t1 values (1,1),(2,2),(3,3),(4,4),(5,5),(6,6),(null,7),(9,9),(8,8),(7,7),(null,9),(null,9),(6,6);
|
|
Warnings:
|
|
Warning 1062 Duplicate entry '6-6' for key 'b'
|
|
analyze table t1;
|
|
Table Op Msg_type Msg_text
|
|
test.t1 analyze status OK
|
|
explain format=tree select * from t1 where (a is null or a = 7) and b=7;
|
|
EXPLAIN
|
|
-> Filter: ((t1.a is null) or (t1.a = 7)) (cost=0.27 rows=0)
|
|
-> Index lookup on t1 using b_2 (b=7) (cost=0.27 rows=1)
|
|
|
|
drop table t1;
|
|
set optimizer_switch=default;
|