sql-server数据库中利用触发器实现表与表之间的级联删除

create trigger Delete_Student --创建一个触发器
on student
instead of delete
as
  declare @sno varchar()
  select @sno= sno from  deleted
  delete from score  where sno=@sno
  delete from student where sno=@sno
go
 delete from Student where Sno=''
 select *from Student
 select *from Score