检查订单表，如果删除的雇员没有接受订单，可以删除该雇员信息，否则撤消删除，显示“不能删除该雇员！”信息。
create trigger tri_employee_del
on Employee
after delete
as
declare @var_雇员ID int
if exists(select * from P_order where 雇员ID=@var_雇员ID)
delete from Employee where 雇员ID=@var_雇员ID
else
print(不能删除该雇员!)
rollback
go
delete Employee
where 雇员ID=7
go
请问哪里出错了！！！