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|
select 0 + b'1';
0 + b'1'
1
select 0 + b'0';
0 + b'0'
0
select 0 + b'000001';
0 + b'000001'
1
select 0 + b'000011';
0 + b'000011'
3
select 0 + b'000101';
0 + b'000101'
5
select 0 + b'000000';
0 + b'000000'
0
select 0 + b'10000000';
0 + b'10000000'
128
select 0 + b'11111111';
0 + b'11111111'
255
select 0 + b'10000001';
0 + b'10000001'
129
select 0 + b'1000000000000000';
0 + b'1000000000000000'
32768
select 0 + b'1111111111111111';
0 + b'1111111111111111'
65535
select 0 + b'1000000000000001';
0 + b'1000000000000001'
32769
drop table if exists t1;
create table t1 (a bit(65)) engine=innodb;
ERROR 42000: Display width out of range for 'a' (max = 64)
create table t1 (a bit(0)) engine=innodb;
show create table t1;
Table Create Table
t1 CREATE TABLE `t1` (
`a` bit(1) DEFAULT NULL
) ENGINE=ENGINE DEFAULT CHARSET=latin1
drop table t1;
create table t1 (a bit(64)) engine=innodb;
insert into t1 values
(b'1111111111111111111111111111111111111111111111111111111111111111'),
(b'1000000000000000000000000000000000000000000000000000000000000000'),
(b'0000000000000000000000000000000000000000000000000000000000000001'),
(b'1010101010101010101010101010101010101010101010101010101010101010'),
(b'0101010101010101010101010101010101010101010101010101010101010101');
select hex(a) from t1;
hex(a)
FFFFFFFFFFFFFFFF
8000000000000000
1
AAAAAAAAAAAAAAAA
5555555555555555
drop table t1;
create table t1 (a bit) engine=innodb;
insert into t1 values (b'0'), (b'1'), (b'000'), (b'100'), (b'001');
Warnings:
Warning 1264 Out of range value for column 'a' at row 4
select hex(a) from t1;
hex(a)
0
1
0
1
1
alter table t1 add unique (a);
ERROR 23000: Duplicate entry '' for key 'a'
drop table t1;
create table t1 (a bit(2)) engine=innodb;
insert into t1 values (b'00'), (b'01'), (b'10'), (b'100');
Warnings:
Warning 1264 Out of range value for column 'a' at row 4
select a+0 from t1;
a+0
0
1
2
3
alter table t1 add key (a);
analyze table t1;
explain select a+0 from t1;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 index NULL a 2 NULL 4 Using index
select a+0 from t1;
a+0
0
1
2
3
drop table t1;
create table t1 (a bit(7), b bit(9), key(a, b)) engine=innodb;
insert into t1 values
(94, 46), (31, 438), (61, 152), (78, 123), (88, 411), (122, 118), (0, 177),
(75, 42), (108, 67), (79, 349), (59, 188), (68, 206), (49, 345), (118, 380),
(111, 368), (94, 468), (56, 379), (77, 133), (29, 399), (9, 363), (23, 36),
(116, 390), (119, 368), (87, 351), (123, 411), (24, 398), (34, 202), (28, 499),
(30, 83), (5, 178), (60, 343), (4, 245), (104, 280), (106, 446), (127, 403),
(44, 307), (68, 454), (57, 135);
analyze table t1;
explain select a+0 from t1;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 index NULL a 5 NULL 38 Using index
select a+0 from t1;
a+0
0
4
5
9
23
24
28
29
30
31
34
44
49
56
57
59
60
61
68
68
75
77
78
79
87
88
94
94
104
106
108
111
116
118
119
122
123
127
explain select b+0 from t1;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 index NULL a 5 NULL 38 Using index
select b+0 from t1;
b+0
177
245
178
363
36
398
499
399
83
438
202
307
345
379
135
188
343
152
206
454
42
133
123
349
351
411
46
468
280
446
67
368
390
380
368
118
411
403
explain select a+0, b+0 from t1;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 index NULL a 5 NULL 38 Using index
select a+0, b+0 from t1;
a+0 b+0
0 177
4 245
5 178
9 363
23 36
24 398
28 499
29 399
30 83
31 438
34 202
44 307
49 345
56 379
57 135
59 188
60 343
61 152
68 206
68 454
75 42
77 133
78 123
79 349
87 351
88 411
94 46
94 468
104 280
106 446
108 67
111 368
116 390
118 380
119 368
122 118
123 411
127 403
explain select a+0, b+0 from t1 where a > 40 and b > 200 order by 1;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range a a 2 NULL 27 Using where; Using index; Using filesort
select a+0, b+0 from t1 where a > 40 and b > 200 order by 1;
a+0 b+0
44 307
49 345
56 379
60 343
68 206
68 454
79 349
87 351
88 411
94 468
104 280
106 446
111 368
116 390
118 380
119 368
123 411
127 403
explain select a+0, b+0 from t1 where a > 40 and a < 70 order by 2;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range a a 2 NULL 9 Using where; Using index; Using filesort
select a+0, b+0 from t1 where a > 40 and a < 70 order by 2;
a+0 b+0
57 135
61 152
59 188
68 206
44 307
60 343
49 345
56 379
68 454
set @@max_length_for_sort_data=0;
Warnings:
Warning 1292 Truncated incorrect max_length_for_sort_data value: '0'
select a+0, b+0 from t1 where a > 40 and a < 70 order by 2;
a+0 b+0
57 135
61 152
59 188
68 206
44 307
60 343
49 345
56 379
68 454
select hex(min(a)) from t1;
hex(min(a))
0
select hex(min(b)) from t1;
hex(min(b))
24
select hex(min(a)), hex(max(a)), hex(min(b)), hex(max(b)) from t1;
hex(min(a)) hex(max(a)) hex(min(b)) hex(max(b))
0 7F 24 1F3
drop table t1;
create table t1 (a int not null, b bit, c bit(9), key(a, b, c)) engine=innodb;
insert into t1 values
(4, NULL, 1), (4, 0, 3), (2, 1, 4), (1, 1, 100), (4, 0, 23), (4, 0, 54),
(56, 0, 22), (4, 1, 100), (23, 0, 1), (4, 0, 34);
select a+0, b+0, c+0 from t1;
a+0 b+0 c+0
1 1 100
2 1 4
4 NULL 1
4 0 3
4 0 23
4 0 34
4 0 54
4 1 100
23 0 1
56 0 22
select hex(min(b)) from t1 where a = 4;
hex(min(b))
0
select hex(min(c)) from t1 where a = 4 and b = 0;
hex(min(c))
3
select hex(max(b)) from t1;
hex(max(b))
1
select a+0, b+0, c+0 from t1 where a = 4 and b = 0 limit 2;
a+0 b+0 c+0
4 0 3
4 0 23
select a+0, b+0, c+0 from t1 where a = 4 and b = 1;
a+0 b+0 c+0
4 1 100
select a+0, b+0, c+0 from t1 where a = 4 and b = 1 and c=100;
a+0 b+0 c+0
4 1 100
select a+0, b+0, c+0 from t1 order by b desc;
a+0 b+0 c+0
2 1 4
1 1 100
4 1 100
4 0 3
4 0 23
4 0 54
56 0 22
23 0 1
4 0 34
4 NULL 1
select a+0, b+0, c+0 from t1 order by c;
a+0 b+0 c+0
4 NULL 1
23 0 1
4 0 3
2 1 4
56 0 22
4 0 23
4 0 34
4 0 54
1 1 100
4 1 100
drop table t1;
create table t1(a bit(2), b bit(2)) engine=innodb;
insert into t1 (a) values (0x01), (0x03), (0x02);
update t1 set b= concat(a);
select a+0, b+0 from t1;
a+0 b+0
1 1
3 3
2 2
drop table t1;
create table t1 (a bit(7), key(a)) engine=innodb;
insert into t1 values (44), (57);
select a+0 from t1;
a+0
44
57
drop table t1;
create table t1 (a bit(3), b bit(12)) engine=innodb;
insert into t1 values (7,(1<<12)-2), (0x01,0x01ff);
select hex(a),hex(b) from t1;
hex(a) hex(b)
7 FFE
1 1FF
select hex(concat(a)),hex(concat(b)) from t1;
hex(concat(a)) hex(concat(b))
07 0FFE
01 01FF
drop table t1;
create table t1(a int, b bit not null) engine=innodb;
alter table t1 add primary key (a);
drop table t1;
create table t1 (a bit, b bit(10)) engine=innodb;
show create table t1;
Table Create Table
t1 CREATE TABLE `t1` (
`a` bit(1) DEFAULT NULL,
`b` bit(10) DEFAULT NULL
) ENGINE=ENGINE DEFAULT CHARSET=latin1
alter table t1 engine=heap;
show create table t1;
Table Create Table
t1 CREATE TABLE `t1` (
`a` bit(1) DEFAULT NULL,
`b` bit(10) DEFAULT NULL
) ENGINE=ENGINE DEFAULT CHARSET=latin1
alter table t1 engine=innodb;
show create table t1;
Table Create Table
t1 CREATE TABLE `t1` (
`a` bit(1) DEFAULT NULL,
`b` bit(10) DEFAULT NULL
) ENGINE=ENGINE DEFAULT CHARSET=latin1
drop table t1;
create table t1 (a bit(7)) engine=innodb;
insert into t1 values (0x60);
select * from t1;
Catalog Database Table Table_alias Column Column_alias Type Length Max length Is_null Flags Decimals Charsetnr
def test t1 t1 a a 16 7 1 Y 32 0 63
a
`
drop table t1;
End of 5.0 tests
|
