創建一個觸發器

語法：create?trigger?觸發器名字create?trigger?xiaoshou_update_trigger

after?update?on?xiaoshou

for?each?row

begin

update?jiangjin

set?xiaoshouer=(

select?sum(taoshu*danjia)from?xiaoshou

where?userid=new.userid

and?month=new.month)?,

jiangjin=(select?sum(taoshu*xiaoshou.danjia*ticheng)

from?house,xiaoshou

where?userid=new.userid

and?month=new.month?and?houseid=id)

where?userid=new.userid

and?month=new.month;delete?from

jiangjin?where?xiaoshouer<500;

delete?from?jiangjin?where?xiaoshouer<500;

end

總結

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