2003-10-31 10:02:16 +01:00
drop table if exists t1;
create table t1 (a int, key (a));
insert into t1 values (NULL), (0), (1), (2), (3), (4), (5), (6), (7), (8), (9),
(10), (11), (12), (13), (14), (15), (16), (17), (18), (19);
explain select * from t1 where not(not(a));
id select_type table type possible_keys key key_len ref rows Extra
2011-07-21 11:29:00 +02:00
1 SIMPLE t1 range a a 5 NULL 20 Using where; Using index
2003-10-31 10:02:16 +01:00
select * from t1 where not(not(a));
a
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
explain select * from t1 where not(not(not(a > 10)));
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range a a 5 NULL 10 Using where; Using index
select * from t1 where not(not(not(a > 10)));
a
0
1
2
3
4
5
6
7
8
9
10
explain select * from t1 where not(not(not(a < 5) and not(a > 10)));
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range a a 5 NULL 5 Using where; Using index
select * from t1 where not(not(not(a < 5) and not(a > 10)));
a
5
6
7
8
9
10
explain select * from t1 where not(a = 10);
id select_type table type possible_keys key key_len ref rows Extra
2003-10-31 13:37:36 +01:00
1 SIMPLE t1 range a a 5 NULL 19 Using where; Using index
2003-10-31 10:02:16 +01:00
select * from t1 where not(a = 10);
a
0
1
2
3
4
5
6
7
8
9
11
12
13
14
15
16
17
18
19
explain select * from t1 where not(a != 10);
id select_type table type possible_keys key key_len ref rows Extra
2009-12-15 08:16:46 +01:00
1 SIMPLE t1 ref a a 5 const 1 Using index
2003-10-31 10:02:16 +01:00
select * from t1 where not(a != 1);
a
1
explain select * from t1 where not(a < 10);
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range a a 5 NULL 11 Using where; Using index
select * from t1 where not(a < 10);
a
10
11
12
13
14
15
16
17
18
19
explain select * from t1 where not(a >= 10);
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range a a 5 NULL 9 Using where; Using index
select * from t1 where not(a >= 10);
a
0
1
2
3
4
5
6
7
8
9
explain select * from t1 where not(a > 10);
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range a a 5 NULL 10 Using where; Using index
select * from t1 where not(a > 10);
a
0
1
2
3
4
5
6
7
8
9
10
explain select * from t1 where not(a <= 10);
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range a a 5 NULL 10 Using where; Using index
select * from t1 where not(a <= 10);
a
11
12
13
14
15
16
17
18
19
explain select * from t1 where not(a is null);
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range a a 5 NULL 20 Using where; Using index
select * from t1 where not(a is null);
a
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
explain select * from t1 where not(a is not null);
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ref a a 5 const 1 Using where; Using index
select * from t1 where not(a is not null);
a
NULL
explain select * from t1 where not(a < 5 or a > 15);
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range a a 5 NULL 10 Using where; Using index
select * from t1 where not(a < 5 or a > 15);
a
5
6
7
8
9
10
11
12
13
14
15
explain select * from t1 where not(a < 15 and a > 5);
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range a a 5 NULL 12 Using where; Using index
select * from t1 where not(a < 15 and a > 5);
a
0
1
2
3
4
5
15
16
17
18
19
explain select * from t1 where a = 2 or not(a < 10);
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range a a 5 NULL 12 Using where; Using index
select * from t1 where a = 2 or not(a < 10);
a
2
10
11
12
13
14
15
16
17
18
19
explain select * from t1 where a > 5 and not(a > 10);
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range a a 5 NULL 4 Using where; Using index
select * from t1 where a > 5 and not(a > 10);
a
6
7
8
9
10
explain select * from t1 where a > 5 xor a < 10;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 index NULL a 5 NULL 21 Using where; Using index
select * from t1 where a > 5 xor a < 10;
a
0
1
2
3
4
5
10
11
12
13
14
15
16
17
18
19
explain select * from t1 where a = 2 or not(a < 5 or a > 15);
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range a a 5 NULL 11 Using where; Using index
select * from t1 where a = 2 or not(a < 5 or a > 15);
a
2
5
6
7
8
9
10
11
12
13
14
15
explain select * from t1 where a = 7 or not(a < 15 and a > 5);
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range a a 5 NULL 13 Using where; Using index
select * from t1 where a = 7 or not(a < 15 and a > 5);
a
0
1
2
3
4
5
7
15
16
17
18
19
explain select * from t1 where NULL or not(a < 15 and a > 5);
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range a a 5 NULL 12 Using where; Using index
select * from t1 where NULL or not(a < 15 and a > 5);
a
0
1
2
3
4
5
15
16
17
18
19
explain select * from t1 where not(NULL and a > 5);
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range a a 5 NULL 6 Using where; Using index
select * from t1 where not(NULL and a > 5);
a
0
1
2
3
4
5
explain select * from t1 where not(NULL or a);
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE NULL NULL NULL NULL NULL NULL NULL Impossible WHERE
select * from t1 where not(NULL or a);
a
explain select * from t1 where not(NULL and a);
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 index NULL a 5 NULL 21 Using where; Using index
select * from t1 where not(NULL and a);
a
0
explain select * from t1 where not((a < 5 or a < 10) and (not(a > 16) or a > 17));
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range a a 5 NULL 11 Using where; Using index
select * from t1 where not((a < 5 or a < 10) and (not(a > 16) or a > 17));
a
10
11
12
13
14
15
16
17
18
19
explain select * from t1 where not((a < 5 and a < 10) and (not(a > 16) or a > 17));
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range a a 5 NULL 15 Using where; Using index
select * from t1 where not((a < 5 and a < 10) and (not(a > 16) or a > 17));
a
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
explain select * from t1 where ((a between 5 and 15) and (not(a like 10)));
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range a a 5 NULL 10 Using where; Using index
select * from t1 where ((a between 5 and 15) and (not(a like 10)));
a
5
6
7
8
9
11
12
13
14
15
2011-07-11 21:48:35 +02:00
# XOR (Note: XOR is negated by negating one of the operands)
# Should return 6,7
SELECT * FROM t1 WHERE ((a > 5) XOR (a > 7));
a
6
7
# Should return 0..5,8..19
SELECT * FROM t1 WHERE ((NOT (a > 5)) XOR (a > 7));
a
0
1
2
3
4
5
8
9
10
11
12
13
14
15
16
17
18
19
SELECT * FROM t1 WHERE ((a > 5) XOR (NOT (a > 7)));
a
0
1
2
3
4
5
8
9
10
11
12
13
14
15
16
17
18
19
SELECT * FROM t1 WHERE NOT ((a > 5) XOR (a > 7));
a
0
1
2
3
4
5
8
9
10
11
12
13
14
15
16
17
18
19
# Should return 6,7
SELECT * FROM t1 WHERE NOT ((NOT (a > 5)) XOR (a > 7));
a
6
7
SELECT * FROM t1 WHERE NOT ((a > 5) XOR (NOT (a > 7)));
a
6
7
# Should return 0..5,8..19
SELECT * FROM t1 WHERE NOT ((NOT (a > 5)) XOR (NOT (a > 7)));
a
0
1
2
3
4
5
8
9
10
11
12
13
14
15
16
17
18
19
# Should have empty result
SELECT * FROM t1 WHERE (NULL XOR (a > 7));
a
SELECT * FROM t1 WHERE NOT (NULL XOR (a > 7));
a
# Should be simplified to "...WHERE (a XOR a)
EXPLAIN EXTENDED SELECT * FROM t1 WHERE NOT ((NOT a) XOR (a));
id select_type table type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 index NULL a 5 NULL 21 100.00 Using where; Using index
Warnings:
Note 1003 select `test`.`t1`.`a` AS `a` from `test`.`t1` where (`test`.`t1`.`a` xor `test`.`t1`.`a`)
# Should be simplified to "...WHERE (a XOR a)
EXPLAIN EXTENDED SELECT * FROM t1 WHERE NOT (a XOR (NOT a));
id select_type table type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 index NULL a 5 NULL 21 100.00 Using where; Using index
Warnings:
Note 1003 select `test`.`t1`.`a` AS `a` from `test`.`t1` where (`test`.`t1`.`a` xor `test`.`t1`.`a`)
# End XOR
2004-08-31 20:10:57 +02:00
delete from t1 where a > 3;
select a, not(not(a)) from t1;
a not(not(a))
NULL NULL
0 0
1 1
2 1
3 1
explain extended select a, not(not(a)), not(a <= 2 and not(a)), not(a not like "1"), not (a not in (1,2)), not(a != 2) from t1 where not(not(a)) having not(not(a));
2006-07-28 19:27:01 +02:00
id select_type table type possible_keys key key_len ref rows filtered Extra
2011-07-21 11:29:00 +02:00
1 SIMPLE t1 range a a 5 NULL 4 100.00 Using where; Using index
2004-08-31 20:10:57 +02:00
Warnings:
2011-07-21 11:29:00 +02:00
Note 1003 select `test`.`t1`.`a` AS `a`,(`test`.`t1`.`a` <> 0) AS `not(not(a))`,((`test`.`t1`.`a` > 2) or `test`.`t1`.`a`) AS `not(a <= 2 and not(a))`,(`test`.`t1`.`a` like '1') AS `not(a not like "1")`,(`test`.`t1`.`a` in (1,2)) AS `not (a not in (1,2))`,(`test`.`t1`.`a` = 2) AS `not(a != 2)` from `test`.`t1` where (`test`.`t1`.`a` <> 0) having (`test`.`t1`.`a` <> 0)
2003-10-31 10:02:16 +01:00
drop table t1;
