Sqlserver触发器语句转换成MySql语句

--创建delete触发器，实现学校信息级联删除

create trigger dSclno_trig on School
instead of delete
as
begin
declare @sclno varchar(20)
select @sclno=Sclno from deleted
delete from Stu_Scl where Sclno=@sclno
delete from Scl_Maj where Sclno=@sclno
delete from School where Sclno=@sclno
end;

--AFTER触发器的应用实现
--创建updata触发器，要求当在学校信息表（School）修改学校编号字段时，Scl_Maj中的学校编号也相应修改

create trigger Sclno_trig
on School
for update
as
if update(Sclno)
update Scl_Maj
set Scl_Maj.Sclno=(select Sclno from inserted)
where Scl_Maj.Sclno=(select Sclno from deleted)

第一个触发器改成before,用old.sclno 来删Stu_Scl和Scl_Maj就好了
第二个触发器,where里找old.sclno,然后更新成new.sclno

具体语法请参考官方文档