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
|
set sql_mode=strict_all_tables;
set time_zone="+02:00";
create table t1 (a int not null, b int, c int);
create trigger trgi before insert on t1 for each row set new.a=if(new.a is null,new.b,new.c);
insert t1 values (10, NULL, 1);
insert t1 values (NULL, 2, NULL);
insert t1 values (NULL, NULL, 20);
ERROR 23000: Column 'a' cannot be null
insert t1 values (1, 2, NULL);
ERROR 23000: Column 'a' cannot be null
select * from t1;
a b c
1 NULL 1
2 2 NULL
insert ignore t1 values (NULL, NULL, 30);
Warnings:
Warning 1048 Column 'a' cannot be null
insert ignore t1 values (1, 3, NULL);
Warnings:
Warning 1048 Column 'a' cannot be null
select * from t1;
a b c
1 NULL 1
2 2 NULL
0 NULL 30
0 3 NULL
insert t1 set a=NULL, b=4, c=a;
select * from t1;
a b c
1 NULL 1
2 2 NULL
0 NULL 30
0 3 NULL
4 4 NULL
delete from t1;
insert t1 (a,c) values (10, 1);
insert t1 (a,b) values (NULL, 2);
insert t1 (a,c) values (NULL, 20);
ERROR 23000: Column 'a' cannot be null
insert t1 (a,b) values (1, 2);
ERROR 23000: Column 'a' cannot be null
select * from t1;
a b c
1 NULL 1
2 2 NULL
delete from t1;
insert t1 select 10, NULL, 1;
insert t1 select NULL, 2, NULL;
insert t1 select NULL, NULL, 20;
ERROR 23000: Column 'a' cannot be null
insert t1 select 1, 2, NULL;
ERROR 23000: Column 'a' cannot be null
insert ignore t1 select NULL, NULL, 30;
Warnings:
Warning 1048 Column 'a' cannot be null
insert ignore t1 select 1, 3, NULL;
Warnings:
Warning 1048 Column 'a' cannot be null
select * from t1;
a b c
1 NULL 1
2 2 NULL
0 NULL 30
0 3 NULL
delete from t1;
insert delayed t1 values (10, NULL, 1);
insert delayed t1 values (NULL, 2, NULL);
insert delayed t1 values (NULL, NULL, 20);
ERROR 23000: Column 'a' cannot be null
insert delayed t1 values (1, 2, NULL);
ERROR 23000: Column 'a' cannot be null
select * from t1;
a b c
1 NULL 1
2 2 NULL
insert delayed ignore t1 values (NULL, NULL, 30);
Warnings:
Warning 1048 Column 'a' cannot be null
insert delayed ignore t1 values (1, 3, NULL);
Warnings:
Warning 1048 Column 'a' cannot be null
flush table t1;
select * from t1;
a b c
1 NULL 1
2 2 NULL
0 NULL 30
0 3 NULL
delete from t1;
alter table t1 add primary key (a);
create trigger trgu before update on t1 for each row set new.a=if(new.a is null,new.b,new.c);
insert t1 values (100,100,100), (200,200,200), (300,300,300);
insert t1 values (100,100,100) on duplicate key update a=10, b=NULL, c=1;
insert t1 values (200,200,200) on duplicate key update a=NULL, b=2, c=NULL;
insert t1 values (300,300,300) on duplicate key update a=NULL, b=NULL, c=20;
ERROR 23000: Column 'a' cannot be null
insert t1 values (300,300,300) on duplicate key update a=1, b=2, c=NULL;
ERROR 23000: Column 'a' cannot be null
select * from t1;
a b c
1 NULL 1
2 2 NULL
300 300 300
delete from t1;
insert t1 values (1,100,1), (2,200,2);
replace t1 values (10, NULL, 1);
replace t1 values (NULL, 2, NULL);
replace t1 values (NULL, NULL, 30);
ERROR 23000: Column 'a' cannot be null
replace t1 values (1, 3, NULL);
ERROR 23000: Column 'a' cannot be null
select * from t1;
a b c
1 NULL 1
2 2 NULL
delete from t1;
insert t1 values (100,100,100), (200,200,200), (300,300,300);
update t1 set a=10, b=NULL, c=1 where a=100;
update t1 set a=NULL, b=2, c=NULL where a=200;
update t1 set a=NULL, b=NULL, c=20 where a=300;
ERROR 23000: Column 'a' cannot be null
update t1 set a=1, b=2, c=NULL where a=300;
ERROR 23000: Column 'a' cannot be null
select * from t1;
a b c
1 NULL 1
2 2 NULL
300 300 300
set statement sql_mode='' for update t1 set a=1, b=2, c=NULL where a > 1;
ERROR 23000: Duplicate entry '0' for key 'PRIMARY'
select * from t1;
a b c
1 NULL 1
0 2 NULL
300 300 300
update t1 set a=NULL, b=4, c=a where a=300;
select * from t1;
a b c
1 NULL 1
0 2 NULL
4 4 NULL
delete from t1;
create table t2 (d int, e int);
insert t1 values (100,100,100), (200,200,200), (300,300,300);
insert t2 select a,b from t1;
update t1,t2 set a=10, b=NULL, c=1 where b=d and e=100;
update t1,t2 set a=NULL, b=2, c=NULL where b=d and e=200;
update t1,t2 set a=NULL, b=NULL, c=20 where b=d and e=300;
ERROR 23000: Column 'a' cannot be null
update t1,t2 set a=1, b=2, c=NULL where b=d and e=300;
ERROR 23000: Column 'a' cannot be null
select * from t1;
a b c
1 NULL 1
2 2 NULL
300 300 300
update t1,t2 set a=NULL, b=4, c=a where b=d and e=300;
select * from t1;
a b c
1 NULL 1
2 2 NULL
4 4 300
delete from t1;
insert t2 values (2,2);
create view v1 as select * from t1, t2 where d=2;
insert v1 (a,c) values (10, 1);
insert v1 (a,b) values (NULL, 2);
insert v1 (a,c) values (NULL, 20);
ERROR 23000: Column 'a' cannot be null
insert v1 (a,b) values (1, 2);
ERROR 23000: Column 'a' cannot be null
select * from v1;
a b c d e
1 NULL 1 2 2
2 2 NULL 2 2
delete from t1;
drop view v1;
drop table t2;
load data infile 'mdev8605.txt' into table t1 fields terminated by ',';
ERROR 23000: Column 'a' cannot be null
select * from t1;
a b c
1 NULL 1
2 2 NULL
drop table t1;
create table t1 (a timestamp, b int auto_increment primary key);
create trigger trgi before insert on t1 for each row set new.a=if(new.a is null, '2000-10-20 10:20:30', NULL);
set statement timestamp=777777777 for insert t1 (a) values (NULL);
set statement timestamp=888888888 for insert t1 (a) values ('1999-12-11 10:9:8');
select b, a, unix_timestamp(a) from t1;
b a unix_timestamp(a)
1 2000-10-20 10:20:30 972030030
2 1998-03-03 03:34:48 888888888
set statement timestamp=999999999 for update t1 set b=3 where b=2;
select b, a, unix_timestamp(a) from t1;
b a unix_timestamp(a)
1 2000-10-20 10:20:30 972030030
3 2001-09-09 03:46:39 999999999
create trigger trgu before update on t1 for each row set new.a='2011-11-11 11:11:11';
update t1 set b=4 where b=3;
select b, a, unix_timestamp(a) from t1;
b a unix_timestamp(a)
1 2000-10-20 10:20:30 972030030
4 2011-11-11 11:11:11 1321002671
drop table t1;
create table t1 (a int auto_increment primary key);
create trigger trgi before insert on t1 for each row set new.a=if(new.a is null, 5, NULL);
insert t1 values (NULL);
insert t1 values (10);
select a from t1;
a
5
6
drop table t1;
create table t1 (a int, b int, c int);
create trigger trgi before insert on t1 for each row set new.a=if(new.a is null,new.b,new.c);
insert t1 values (10, NULL, 1);
insert t1 values (NULL, 2, NULL);
insert t1 values (NULL, NULL, 20);
insert t1 values (1, 2, NULL);
select * from t1;
a b c
1 NULL 1
2 2 NULL
NULL NULL 20
NULL 2 NULL
drop table t1;
create table t1 (a1 tinyint not null, a2 timestamp not null,
a3 tinyint not null auto_increment primary key,
b tinyint, c int not null);
create trigger trgi before insert on t1 for each row
begin
if new.b=1 then set new.a1=if(new.c,new.c,null); end if;
if new.b=2 then set new.a2=if(new.c,new.c,null); end if;
if new.b=3 then set new.a3=if(new.c,new.c,null); end if;
end|
set statement timestamp=777777777 for
load data infile 'sep8605.txt' into table t1 fields terminated by ',';
ERROR 23000: Column 'a1' cannot be null
select * from t1;
a1 a2 a3 b c
1 2010-11-12 01:02:03 10 0 0
2 2010-11-12 01:02:03 11 1 2
3 1994-08-25 03:22:57 12 0 0
4 2000-09-08 07:06:05 13 2 908070605
5 1994-08-25 03:22:57 14 2 0
6 2010-11-12 01:02:03 15 0 0
7 2010-11-12 01:02:03 20 3 20
8 2010-11-12 01:02:03 21 3 0
delete from t1;
set statement timestamp=777777777 for
load data infile 'sep8605.txt' into table t1 fields terminated by ','
(@a,a2,a3,b,c) set a1=100-@a;
ERROR 23000: Column 'a1' cannot be null
select 100-a1,a2,a3,b,c from t1;
100-a1 a2 a3 b c
1 2010-11-12 01:02:03 10 0 0
98 2010-11-12 01:02:03 11 1 2
3 1994-08-25 03:22:57 12 0 0
4 2000-09-08 07:06:05 13 2 908070605
5 1994-08-25 03:22:57 14 2 0
6 2010-11-12 01:02:03 22 0 0
7 2010-11-12 01:02:03 20 3 20
8 2010-11-12 01:02:03 23 3 0
delete from t1;
set statement timestamp=777777777 for
load data infile 'fix8605.txt' into table t1 fields terminated by '';
ERROR 23000: Column 'a1' cannot be null
select * from t1;
a1 a2 a3 b c
1 2010-11-12 01:02:03 10 0 0
5 1994-08-25 03:22:57 14 2 0
8 2010-11-12 01:02:03 24 3 0
delete from t1;
set statement timestamp=777777777 for
load xml infile 'xml8605.txt' into table t1 rows identified by '<row>';
ERROR 23000: Column 'a1' cannot be null
select * from t1;
a1 a2 a3 b c
1 2010-11-12 01:02:03 10 0 0
2 2010-11-12 01:02:03 11 1 2
3 1994-08-25 03:22:57 12 0 0
4 2000-09-08 07:06:05 13 2 908070605
5 1994-08-25 03:22:57 14 2 0
6 2010-11-12 01:02:03 25 0 0
7 2010-11-12 01:02:03 20 3 20
8 2010-11-12 01:02:03 26 3 0
drop table t1;
create table t1 (a int not null default 5, b int, c int);
create trigger trgi before insert on t1 for each row set new.b=new.c;
insert t1 values (DEFAULT,2,1);
select * from t1;
a b c
5 1 1
drop table t1;
create table t1 (a int not null, b int not null default 5, c int);
create trigger trgi before insert on t1 for each row
begin
if new.c=1 then set new.a=1, new.b=1; end if;
if new.c=2 then set new.a=NULL, new.b=NULL; end if;
if new.c=3 then set new.a=2; end if;
end|
insert t1 values (9, 9, 1);
insert t1 values (9, 9, 2);
ERROR 23000: Column 'a' cannot be null
insert t1 (a,c) values (9, 3);
select * from t1;
a b c
1 1 1
2 5 3
drop table t1;
set session sql_mode ='no_auto_value_on_zero';
create table t1 (id int unsigned auto_increment primary key);
insert t1 values (0);
select * from t1;
id
0
delete from t1;
create trigger t1_bi before insert on t1 for each row begin end;
insert t1 values (0);
insert t1 (id) values (0);
ERROR 23000: Duplicate entry '0' for key 'PRIMARY'
drop table t1;
create table t1 (a int not null, b int);
create trigger trgi before update on t1 for each row do 1;
insert t1 values (1,1),(2,2),(3,3),(1,4);
create table t2 select a as c, b as d from t1;
update t1 set a=(select count(c) from t2 where c+1=a+1 group by a);
select * from t1;
a b
2 1
1 2
1 3
2 4
drop table t1, t2;
create table t1 (a int not null);
create table t2 (f1 int unsigned not null, f2 int);
insert into t2 values (1, null);
create trigger tr1 before update on t1 for each row do 1;
create trigger tr2 after update on t2 for each row update t1 set a=new.f2;
update t2 set f2=1 where f1=1;
drop table t1, t2;
create table t1 (a int not null, primary key (a));
insert into t1 (a) values (1);
show columns from t1;
Field Type Null Key Default Extra
a int(11) NO PRI NULL
create trigger t1bu before update on t1 for each row begin end;
show columns from t1;
Field Type Null Key Default Extra
a int(11) NO PRI NULL
insert into t1 (a) values (3);
show columns from t1;
Field Type Null Key Default Extra
a int(11) NO PRI NULL
drop table t1;
create table t1 (
pk int primary key,
i int,
v1 int as (i) virtual,
v2 int as (i) virtual
);
create trigger tr before update on t1 for each row set @a = 1;
insert into t1 (pk, i) values (null, null);
ERROR 23000: Column 'pk' cannot be null
drop table t1;
|
