set sql_mode='strict_all_tables';
create table t1 (a int not null, b int);
insert t1 (b) values (1);
ERROR HY000: Field 'a' doesn't have a default value
create trigger trgi before insert on t1 for each row
case new.b
when 10 then
set new.a = new.b;
when 30 then
set new.a = new.a;
else
do 1;
end case|
insert t1 (b) values (10);
insert t1 (b) values (20);
ERROR HY000: Field 'a' doesn't have a default value
insert t1 (b) values (30);
select * from t1;
a	b
10	10
0	30
drop table t1;
set sql_mode=default;
create table t1 (
id int(11) not null auto_increment primary key,
data1 varchar(10) not null,
data2 varchar(10) not null
);
insert into t1 (data2) values ('x');
Warnings:
Warning	1364	Field 'data1' doesn't have a default value
create trigger test_trigger before insert on t1 for each row begin end;
insert into t1 (data2) values ('y');
Warnings:
Warning	1364	Field 'data1' doesn't have a default value
select * from t1;
id	data1	data2
1		x
2		y
drop table t1;