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
|
drop table if exists t1,t2,t3,t11,t12;
CREATE TABLE t1 (a tinyint(3), b tinyint(5));
INSERT INTO t1 VALUES (1,1);
INSERT LOW_PRIORITY INTO t1 VALUES (1,2);
INSERT INTO t1 VALUES (1,3);
DELETE from t1 where a=1 limit 1;
DELETE LOW_PRIORITY from t1 where a=1;
INSERT INTO t1 VALUES (1,1);
DELETE from t1;
LOCK TABLE t1 write;
INSERT INTO t1 VALUES (1,2);
DELETE from t1;
UNLOCK TABLES;
INSERT INTO t1 VALUES (1,2);
SET AUTOCOMMIT=0;
DELETE from t1;
SET AUTOCOMMIT=1;
drop table t1;
create table t1 (
a bigint not null,
b bigint not null default 0,
c bigint not null default 0,
d bigint not null default 0,
e bigint not null default 0,
f bigint not null default 0,
g bigint not null default 0,
h bigint not null default 0,
i bigint not null default 0,
j bigint not null default 0,
primary key (a,b,c,d,e,f,g,h,i,j));
insert into t1 (a) values (2),(4),(6),(8),(10),(12),(14),(16),(18),(20),(22),(24),(26),(23);
delete from t1 where a=26;
drop table t1;
create table t1 (
a bigint not null,
b bigint not null default 0,
c bigint not null default 0,
d bigint not null default 0,
e bigint not null default 0,
f bigint not null default 0,
g bigint not null default 0,
h bigint not null default 0,
i bigint not null default 0,
j bigint not null default 0,
primary key (a,b,c,d,e,f,g,h,i,j));
insert into t1 (a) values (2),(4),(6),(8),(10),(12),(14),(16),(18),(20),(22),(24),(26),(23),(27);
delete from t1 where a=27;
drop table t1;
CREATE TABLE `t1` (
`i` int(10) NOT NULL default '0',
`i2` int(10) NOT NULL default '0',
PRIMARY KEY (`i`)
);
DELETE FROM t1 USING t1 WHERE post='1';
ERROR 42S22: Unknown column 'post' in 'where clause'
drop table t1;
CREATE TABLE t1 (
bool char(0) default NULL,
not_null varchar(20) binary NOT NULL default '',
misc integer not null,
PRIMARY KEY (not_null)
) ENGINE=MyISAM;
INSERT INTO t1 VALUES (NULL,'a',4), (NULL,'b',5), (NULL,'c',6), (NULL,'d',7);
select * from t1 where misc > 5 and bool is null;
bool not_null misc
NULL c 6
NULL d 7
delete from t1 where misc > 5 and bool is null;
select * from t1 where misc > 5 and bool is null;
bool not_null misc
select count(*) from t1;
count(*)
2
delete from t1 where 1 > 2;
select count(*) from t1;
count(*)
2
delete from t1 where 3 > 2;
select count(*) from t1;
count(*)
0
drop table t1;
create table t1 (a int not null auto_increment primary key, b char(32));
insert into t1 (b) values ('apple'), ('apple');
select * from t1;
a b
1 apple
2 apple
delete t1 from t1, t1 as t2 where t1.b = t2.b and t1.a > t2.a;
select * from t1;
a b
1 apple
drop table t1;
create table t11 (a int NOT NULL, b int, primary key (a));
create table t12 (a int NOT NULL, b int, primary key (a));
create table t2 (a int NOT NULL, b int, primary key (a));
insert into t11 values (0, 10),(1, 11),(2, 12);
insert into t12 values (33, 10),(0, 11),(2, 12);
insert into t2 values (1, 21),(2, 12),(3, 23);
select * from t11;
a b
0 10
1 11
2 12
select * from t12;
a b
33 10
0 11
2 12
select * from t2;
a b
1 21
2 12
3 23
delete t11.*, t12.* from t11,t12 where t11.a = t12.a and t11.b <> (select b from t2 where t11.a < t2.a);
ERROR 21000: Subquery returns more than 1 row
select * from t11;
a b
0 10
1 11
2 12
select * from t12;
a b
33 10
0 11
2 12
delete ignore t11.*, t12.* from t11,t12 where t11.a = t12.a and t11.b <> (select b from t2 where t11.a < t2.a);
Warnings:
Error 1242 Subquery returns more than 1 row
Error 1242 Subquery returns more than 1 row
select * from t11;
a b
0 10
1 11
select * from t12;
a b
33 10
0 11
insert into t11 values (2, 12);
delete from t11 where t11.b <> (select b from t2 where t11.a < t2.a);
ERROR 21000: Subquery returns more than 1 row
select * from t11;
a b
0 10
1 11
2 12
delete ignore from t11 where t11.b <> (select b from t2 where t11.a < t2.a);
Warnings:
Error 1242 Subquery returns more than 1 row
Error 1242 Subquery returns more than 1 row
select * from t11;
a b
0 10
1 11
drop table t11, t12, t2;
create table t1 (a int, b int, unique key (a), key (b));
insert into t1 values (3, 3), (7, 7);
delete t1 from t1 where a = 3;
check table t1;
Table Op Msg_type Msg_text
test.t1 check status OK
select * from t1;
a b
7 7
drop table t1;
CREATE TABLE t1 ( a int PRIMARY KEY );
DELETE FROM t1 WHERE t1.a > 0 ORDER BY t1.a;
INSERT INTO t1 VALUES (0),(1),(2);
DELETE FROM t1 WHERE t1.a > 0 ORDER BY t1.a LIMIT 1;
SELECT * FROM t1;
a
0
2
DROP TABLE t1;
create table t1 (a int);
delete `4.t1` from t1 as `4.t1` where `4.t1`.a = 5;
delete FROM `4.t1` USING t1 as `4.t1` where `4.t1`.a = 5;
drop table t1;
create table t1(f1 int primary key);
insert into t1 values (4),(3),(1),(2);
delete from t1 where (@a:= f1) order by f1 limit 1;
select @a;
@a
1
drop table t1;
CREATE TABLE t1 (
`date` date ,
`time` time ,
`seq` int(10) unsigned NOT NULL auto_increment,
PRIMARY KEY (`seq`),
KEY `seq` (`seq`),
KEY `time` (`time`),
KEY `date` (`date`)
);
DELETE FROM t1 ORDER BY date ASC, time ASC LIMIT 1;
drop table t1;
End of 4.1 tests
CREATE TABLE t1 (a int not null,b int not null);
CREATE TABLE t2 (a int not null, b int not null, primary key (a,b));
CREATE TABLE t3 (a int not null, b int not null, primary key (a,b));
insert into t1 values (1,1),(2,1),(1,3);
insert into t2 values (1,1),(2,2),(3,3);
insert into t3 values (1,1),(2,1),(1,3);
select * from t1,t2,t3 where t1.a=t2.a AND t2.b=t3.a and t1.b=t3.b;
a b a b a b
1 1 1 1 1 1
2 1 2 2 2 1
1 3 1 1 1 3
explain select * from t1,t2,t3 where t1.a=t2.a AND t2.b=t3.a and t1.b=t3.b;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ALL NULL NULL NULL NULL 3
1 SIMPLE t2 ref PRIMARY PRIMARY 4 test.t1.a 1 Using index
1 SIMPLE t3 eq_ref PRIMARY PRIMARY 8 test.t2.b,test.t1.b 1 Using index
delete t2.*,t3.* from t1,t2,t3 where t1.a=t2.a AND t2.b=t3.a and t1.b=t3.b;
select * from t3;
a b
drop table t1,t2,t3;
create table t1(a date not null);
insert into t1 values (0);
select * from t1 where a is null;
a
0000-00-00
delete from t1 where a is null;
select count(*) from t1;
count(*)
0
drop table t1;
CREATE TABLE t1 (a INT);
INSERT INTO t1 VALUES (1);
DELETE FROM t1 ORDER BY x;
ERROR 42S22: Unknown column 'x' in 'order clause'
DELETE FROM t1 ORDER BY t2.x;
ERROR 42S22: Unknown column 't2.x' in 'order clause'
DELETE FROM t1 ORDER BY (SELECT x);
ERROR 42S22: Unknown column 'x' in 'field list'
DROP TABLE t1;
CREATE TABLE t1 (
a INT
);
CREATE TABLE t2 (
a INT
);
CREATE DATABASE db1;
CREATE TABLE db1.t1 (
a INT
);
INSERT INTO db1.t1 (a) SELECT * FROM t1;
CREATE DATABASE db2;
CREATE TABLE db2.t1 (
a INT
);
INSERT INTO db2.t1 (a) SELECT * FROM t2;
DELETE FROM t1 alias USING t1, t2 alias WHERE t1.a = alias.a;
ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'alias USING t1, t2 alias WHERE t1.a = alias.a' at line 1
DELETE FROM alias USING t1, t2 alias WHERE t1.a = alias.a;
DELETE FROM t1, alias USING t1, t2 alias WHERE t1.a = alias.a;
DELETE FROM t1, t2 USING t1, t2 alias WHERE t1.a = alias.a;
ERROR 42S02: Unknown table 't2' in MULTI DELETE
DELETE FROM db1.t1 alias USING db1.t1, db2.t1 alias WHERE db1.t1.a = alias.a;
ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'alias USING db1.t1, db2.t1 alias WHERE db1.t1.a = alias.a' at line 1
DELETE FROM alias USING db1.t1, db2.t1 alias WHERE db1.t1.a = alias.a;
DELETE FROM db2.alias USING db1.t1, db2.t1 alias WHERE db1.t1.a = alias.a;
ERROR 42S02: Unknown table 'alias' in MULTI DELETE
DELETE FROM t1 USING t1 WHERE a = 1;
SELECT * FROM t1;
a
DELETE FROM t1 alias USING t1 alias WHERE a = 2;
ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'alias USING t1 alias WHERE a = 2' at line 1
SELECT * FROM t1;
a
DROP TABLE t1, t2;
DROP DATABASE db1;
DROP DATABASE db2;
End of 5.0 tests
DROP DATABASE IF EXISTS db1;
DROP DATABASE IF EXISTS db2;
DROP DATABASE IF EXISTS db3;
DROP DATABASE IF EXISTS db4;
DROP TABLE IF EXISTS t1, t2;
USE test;
CREATE DATABASE db1;
CREATE DATABASE db2;
CREATE TABLE db1.t1 (a INT, b INT);
INSERT INTO db1.t1 VALUES (1,1),(2,2),(3,3);
CREATE TABLE db1.t2 AS SELECT * FROM db1.t1;
CREATE TABLE db2.t1 AS SELECT * FROM db1.t2;
CREATE TABLE db2.t2 AS SELECT * FROM db2.t1;
CREATE TABLE t1 AS SELECT * FROM db2.t2;
CREATE TABLE t2 AS SELECT * FROM t1;
CREATE DATABASE db3;
USE db3;
DROP DATABASE db3;
SELECT * FROM t1;
ERROR 3D000: No database selected
DELETE a1,a2 FROM db1.t1, db2.t2;
ERROR 3D000: No database selected
DELETE a1,a2 FROM db1.t1, db2.t2;
ERROR 3D000: No database selected
DELETE a1,a2 FROM db1.t1 AS a1, db2.t2;
ERROR 3D000: No database selected
DELETE a1,a2 FROM db1.t1, db2.t2 AS a2;
ERROR 3D000: No database selected
DELETE a1,a2 FROM db3.t1 AS a1, db4.t2 AS a2;
ERROR 3D000: No database selected
DELETE a1,a2 FROM db3.t1 AS a1, db4.t2 AS a2;
ERROR 3D000: No database selected
DELETE FROM a1,a2 USING db1.t1, db2.t2;
ERROR 3D000: No database selected
DELETE FROM a1,a2 USING db1.t1, db2.t2;
ERROR 3D000: No database selected
DELETE FROM a1,a2 USING db1.t1 AS a1, db2.t2;
ERROR 3D000: No database selected
DELETE FROM a1,a2 USING db1.t1, db2.t2 AS a2;
ERROR 3D000: No database selected
DELETE FROM a1,a2 USING db3.t1 AS a1, db4.t2 AS a2;
ERROR 3D000: No database selected
DELETE FROM a1,a2 USING db3.t1 AS a1, db4.t2 AS a2;
ERROR 3D000: No database selected
DELETE a1 FROM db1.t1 AS a1, db2.t2 AS a1;
ERROR 3D000: No database selected
DELETE a1 FROM db1.a1, db2.t2 AS a1;
ERROR 3D000: No database selected
DELETE a1 FROM a1, db1.t1 AS a1;
ERROR 3D000: No database selected
DELETE t1 FROM db1.t1, db2.t1 AS a1;
ERROR 3D000: No database selected
DELETE t1 FROM db1.t1 AS a1, db2.t1 AS a2;
ERROR 3D000: No database selected
DELETE t1 FROM db1.t1, db2.t1;
ERROR 3D000: No database selected
USE test;
DELETE a1,a2 FROM db1.t1, db2.t2;
ERROR 42S02: Unknown table 'a1' in MULTI DELETE
DELETE a1,a2 FROM db1.t1, db2.t2;
ERROR 42S02: Unknown table 'a1' in MULTI DELETE
DELETE a1,a2 FROM db1.t1 AS a1, db2.t2;
ERROR 42S02: Unknown table 'a2' in MULTI DELETE
DELETE a1,a2 FROM db1.t1, db2.t2 AS a2;
ERROR 42S02: Unknown table 'a1' in MULTI DELETE
DELETE a1,a2 FROM db3.t1 AS a1, db4.t2 AS a2;
ERROR 42S02: Table 'db3.t1' doesn't exist
DELETE a1,a2 FROM db3.t1 AS a1, db4.t2 AS a2;
ERROR 42S02: Table 'db3.t1' doesn't exist
DELETE FROM a1,a2 USING db1.t1, db2.t2;
ERROR 42S02: Unknown table 'a1' in MULTI DELETE
DELETE FROM a1,a2 USING db1.t1, db2.t2;
ERROR 42S02: Unknown table 'a1' in MULTI DELETE
DELETE FROM a1,a2 USING db1.t1 AS a1, db2.t2;
ERROR 42S02: Unknown table 'a2' in MULTI DELETE
DELETE FROM a1,a2 USING db1.t1, db2.t2 AS a2;
ERROR 42S02: Unknown table 'a1' in MULTI DELETE
DELETE FROM a1,a2 USING db3.t1 AS a1, db4.t2 AS a2;
ERROR 42S02: Table 'db3.t1' doesn't exist
DELETE FROM a1,a2 USING db3.t1 AS a1, db4.t2 AS a2;
ERROR 42S02: Table 'db3.t1' doesn't exist
DELETE a1 FROM db1.t1 AS a1, db2.t2 AS a1;
ERROR 42000: Not unique table/alias: 'a1'
DELETE a1 FROM db1.a1, db2.t2 AS a1;
ERROR 42S02: Table 'db1.a1' doesn't exist
DELETE a1 FROM a1, db1.t1 AS a1;
ERROR 42000: Not unique table/alias: 'a1'
DELETE t1 FROM db1.t1, db2.t1 AS a1;
ERROR 42S02: Unknown table 't1' in MULTI DELETE
DELETE t1 FROM db1.t1 AS a1, db2.t1 AS a2;
ERROR 42S02: Unknown table 't1' in MULTI DELETE
DELETE t1 FROM db1.t1, db2.t1;
ERROR 42S02: Unknown table 't1' in MULTI DELETE
DELETE t1 FROM db1.t2 AS t1, db2.t2 AS t2 WHERE t2.a = 1 AND t1.a = t2.a;
SELECT ROW_COUNT();
ROW_COUNT()
1
DELETE a1, a2 FROM db2.t1 AS a1, t2 AS a2 WHERE a1.a = 2 AND a2.a = 2;
SELECT ROW_COUNT();
ROW_COUNT()
2
DROP DATABASE db1;
DROP DATABASE db2;
DROP TABLE t1, t2;
|