【例11．1】
（1）use xk
gocreate trigger test1
on student
for update
as print '記錄已修改！'
go（2）
update student set pwd='11111111' where stuno='00000001'
【例11．3】
（1）use xk
goalter trigger test1
on student
instead of update
as print '記錄沒有修改！'
go（2）
update student set pwd='22222222' where stuno='00000001'
【例11．4】
（1）use xk
gocreate trigger setwillnum on stucou
for insert, update, delete
asupdate course set willnum=willnum+1 where couno=(select couno from inserted)
update course set willnum=willnum-1 where couno=(select couno from deleted)
（2）select * from course where couno='002'
select * from course where couno='003'
（3）update stucou set couno='002' where stuno='00000011' and couno='003'
（4）select * from course where couno='002'
select * from course where couno='003'
（5）use xk
goalter trigger setwillnum on stucou
for insert, update, delete
asupdate course set willnum=(select count(*) from stucou where couno=course.couno)
【例11．5】
use xk
goalter trigger test1
on student
for update
as if update(pwd) print '密碼已修改！'
go【例11．6】
use xk
gocreate trigger test2
on student
for update
as print '二次觸發！'
go測試：
update student set pwd='22222222' where stuno='00000001'
【例11．7】
use xk
drop trigger test1
【例11．9】
use xk
gosp_rename setwillnum,updatewillnum
【例11．10】
use xk
goalter table stucou disable trigger updatewillnum
【例11．11】
use xk
goalter table stucou enable trigger updatewillnum
【例11．12】
use xk
goselect * from sysobjects where type='tr'
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