SQL server触发器中 update insert delete 分别给写个例子以及解释下例子的作用和意思被， 万分感谢！！！！
主要想知道下各个语句的书写规范。
INSERT:
表1 (ID,NAME) 表2 (ID,NAME) 当用户插入表1数据后，表2也被插入相同的数据 CREATE TRIGGER TRI1 ON 表1 FOR INSERT AS BEGIN INSERT INTO 表2 SELECT * FROM INSERTED END GO
DELETE:
表1 (ID,NAME) 表2 (ID,AGE,GENDER) 当用户删除表1某条ID的数据后，表2相应ID的数据也被删除 CREATE TRIGGER TRI2 ON 表1 FOR DELETE AS BEGIN DECLARE @id INT SELECT @id FROM DELETED DELETE 表2 WHERE ID = @id END GO
UPDATE:
表1 (ID,NAME) 表2 (ID,NAME) 当用户更改表1 NAME列数据后，表2相应ID的数据也同时更新 CREATE TRIGGER TRI3 ON 表1 FOR UPDATE AS IF UPDATE(NAME) BEGIN UPDATE 表2 SET A.NAME = B.NAME FROM 表2 A, INSERTED B WHERE A.ID = B.ID END GO
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insert 触发器示例
create trigger tri_insert
on student
for insert
as
declare @student_id char(10)
select @student_id=s.student_id from
student s inner join inserted i
on s.student_id=i.student_id
if @student_id='0000000001'
begin
raiserror('不能插入1的学号!',16,8)
rollback tran
end
go
update触发器示例
create trigger tri_update
on student
for update
as
if update(student_id)
begin
raiserror('学号不能修改!',16,8)
rollback tran
end
go
delete触发器示例
create trigger tri_delete
on student
for delete
as
declare @student_id varchar(10)
select @student_id=student_id from deleted
if @student_id='admin'
begin
raiserror('错误',16,8)
rollback tran
end
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