1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
|
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 column '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=InnoDB 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);
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);
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 8 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=InnoDB 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=MEMORY 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=InnoDB 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
|
