引用：http://bbs.mysql.cn/thread-9135-1-2.html
引用：
21. 觸發(fā)程序
create table a (sa int);
create table b (sb int);
drop trigger a_bi ;
delimiter //
create trigger a_bi
before insert on a
for each row Begin
insert into b values(new.sa*100);
end;//
delimiter ;
insert into a values(1);
select * from b ;> 100
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