修改操作 inserted表 deleted表
增加insert 存放新增的記錄 -------
刪除delete --------- 存放被刪除的記錄
修改update 存放更新後的記錄 存放更新前的記錄
使用游標，刪除乙個表的內容，把符合條件的內容增加到另外乙個表
create trigger tg_test0
on t_stu
after delete
as begin
declare @name varchar(50)
declare cur cursor
for select sname from deleted
open cur
while @@fetch_status=0
begin
fetch next from cur into @name
insert into t_outstu values(@name)
endclose cur
deallocate cur
endgo
更新乙個表的某一項資料，把另外乙個表的這個資料也更新
set ansi_nulls on
set quoted_identifier on
goalter trigger [dbo].[tg_teg]
on [dbo].[t_card]
after update
as begin
declare @no int
select @no=no from inserted--更新後的值
declare @nn int
select @nn=no from deleted--更新前的值
update t_borrow set no=@no where no=@nn
endinstead of 觸發器的使用（原操作語句被替換）
lter trigger [dbo].[tg_test]
on [dbo].[t_card]
instead of delete
as begin
declare @n int
declare @m int
select @n=no from deleted
select @m=count(*) from t_borrow where no=@n
if(@m=0)
begin
delete from t_card where no=@n
endelse
begin
select '存在借書記錄不能刪除'
endend
觸發器alter trigger [dbo].[t_t1]
on [dbo].[t_class]
after update
as begin
declare @oldcid int
declare @name varchar(50)
select @name=cname ,@oldcid=cid from deleted
declare @nename varchar(50)
select @nename=cid from t_class where
cname= @nename
update t_stu set cid=@nename where cid=@oldcid
set nocount on;
endalter trigger [dbo].[tg_1]
on [dbo].[t_class]
after update
as begin
declare @n int
declare @m int
select @n=cid from deleted
select @m=cid from inserted
update t_stu set cid=@m where cid=@n
endalter trigger [dbo].[tg_class]
on [dbo].[t_class]
after delete
as begin
set nocount on;
select * from t_class
endalter trigger [dbo].[tg_classid]
on [dbo].[t_class]
after update
as begin
declare @id int
select @id=cid from inserted
update t_stu set cid=@id
where cid in
(select cid from deleted)
endalter trigger [dbo].[tg_delclass]
on [dbo].[t_class]
instead of delete
as begin
declare @id int
select @id=cid from deleted
if exists(select * from t_stu where cid=@id)
begin
select '當前班級存在學生，不能刪除'
endelse
begin
delete from t_class where cid=@id
endend
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