392 lines
7.1 KiB
Plaintext
392 lines
7.1 KiB
Plaintext
drop table if exists t1;
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create table t1 (a int, key (a));
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insert into t1 values (NULL), (0), (1), (2), (3), (4), (5), (6), (7), (8), (9),
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(10), (11), (12), (13), (14), (15), (16), (17), (18), (19);
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explain select * from t1 where not(not(a));
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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 a 5 NULL 21 Using where; Using index
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select * from t1 where not(not(a));
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a
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14
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15
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16
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17
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18
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19
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explain select * from t1 where not(not(not(a > 10)));
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 range a a 5 NULL 10 Using where; Using index
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select * from t1 where not(not(not(a > 10)));
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a
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0
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9
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10
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explain select * from t1 where not(not(not(a < 5) and not(a > 10)));
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 range a a 5 NULL 5 Using where; Using index
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select * from t1 where not(not(not(a < 5) and not(a > 10)));
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a
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5
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6
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7
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8
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9
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10
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explain select * from t1 where not(a = 10);
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 range a a 5 NULL 19 Using where; Using index
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select * from t1 where not(a = 10);
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a
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0
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14
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15
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16
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17
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18
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19
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explain select * from t1 where not(a != 10);
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 ref a a 5 const 1 Using where; Using index
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select * from t1 where not(a != 1);
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a
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1
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explain select * from t1 where not(a < 10);
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 range a a 5 NULL 11 Using where; Using index
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select * from t1 where not(a < 10);
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a
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10
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11
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12
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13
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14
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15
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16
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17
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18
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19
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explain select * from t1 where not(a >= 10);
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 range a a 5 NULL 9 Using where; Using index
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select * from t1 where not(a >= 10);
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a
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0
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9
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explain select * from t1 where not(a > 10);
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 range a a 5 NULL 10 Using where; Using index
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select * from t1 where not(a > 10);
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a
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0
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10
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explain select * from t1 where not(a <= 10);
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 range a a 5 NULL 10 Using where; Using index
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select * from t1 where not(a <= 10);
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a
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11
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12
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13
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14
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15
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16
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17
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18
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19
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explain select * from t1 where not(a is null);
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 range a a 5 NULL 20 Using where; Using index
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select * from t1 where not(a is null);
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a
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0
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1
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2
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5
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7
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10
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11
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14
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15
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16
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17
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18
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19
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explain select * from t1 where not(a is not null);
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 ref a a 5 const 1 Using where; Using index
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select * from t1 where not(a is not null);
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a
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NULL
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explain select * from t1 where not(a < 5 or a > 15);
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 range a a 5 NULL 10 Using where; Using index
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select * from t1 where not(a < 5 or a > 15);
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a
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5
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6
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7
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8
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9
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10
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11
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12
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13
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14
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15
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explain select * from t1 where not(a < 15 and a > 5);
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 range a a 5 NULL 12 Using where; Using index
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select * from t1 where not(a < 15 and a > 5);
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a
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0
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1
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2
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3
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4
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5
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15
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16
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17
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18
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19
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explain select * from t1 where a = 2 or not(a < 10);
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 range a a 5 NULL 12 Using where; Using index
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select * from t1 where a = 2 or not(a < 10);
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a
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2
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10
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11
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12
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13
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14
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15
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16
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17
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19
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explain select * from t1 where a > 5 and not(a > 10);
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 range a a 5 NULL 4 Using where; Using index
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select * from t1 where a > 5 and not(a > 10);
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a
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6
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7
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8
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9
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10
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explain select * from t1 where a > 5 xor a < 10;
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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 a 5 NULL 21 Using where; Using index
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select * from t1 where a > 5 xor a < 10;
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a
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0
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2
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4
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5
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10
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11
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12
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13
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14
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15
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16
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17
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19
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explain select * from t1 where a = 2 or not(a < 5 or a > 15);
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 range a a 5 NULL 11 Using where; Using index
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select * from t1 where a = 2 or not(a < 5 or a > 15);
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a
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2
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5
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10
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15
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explain select * from t1 where a = 7 or not(a < 15 and a > 5);
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 range a a 5 NULL 13 Using where; Using index
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select * from t1 where a = 7 or not(a < 15 and a > 5);
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a
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0
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1
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5
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7
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15
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16
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17
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19
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explain select * from t1 where NULL or not(a < 15 and a > 5);
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 range a a 5 NULL 12 Using where; Using index
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select * from t1 where NULL or not(a < 15 and a > 5);
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a
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0
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1
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15
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19
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explain select * from t1 where not(NULL and a > 5);
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 range a a 5 NULL 6 Using where; Using index
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select * from t1 where not(NULL and a > 5);
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a
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0
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5
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explain select * from t1 where not(NULL or a);
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE NULL NULL NULL NULL NULL NULL NULL Impossible WHERE
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select * from t1 where not(NULL or a);
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a
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explain select * from t1 where not(NULL and a);
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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 a 5 NULL 21 Using where; Using index
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select * from t1 where not(NULL and a);
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a
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0
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explain select * from t1 where not((a < 5 or a < 10) and (not(a > 16) or a > 17));
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 range a a 5 NULL 11 Using where; Using index
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select * from t1 where not((a < 5 or a < 10) and (not(a > 16) or a > 17));
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a
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10
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explain select * from t1 where not((a < 5 and a < 10) and (not(a > 16) or a > 17));
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 range a a 5 NULL 15 Using where; Using index
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select * from t1 where not((a < 5 and a < 10) and (not(a > 16) or a > 17));
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a
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explain select * from t1 where ((a between 5 and 15) and (not(a like 10)));
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 range a a 5 NULL 10 Using where; Using index
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select * from t1 where ((a between 5 and 15) and (not(a like 10)));
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a
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delete from t1 where a > 3;
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select a, not(not(a)) from t1;
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a not(not(a))
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NULL NULL
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0 0
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1 1
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2 1
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3 1
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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));
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id select_type table type possible_keys key key_len ref rows filtered Extra
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1 SIMPLE t1 index NULL a 5 NULL 5 100.00 Using where; Using index
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Warnings:
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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` having `test`.`t1`.`a`
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drop table t1;
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