学步园

　　create table test3(id int primary key not null
　　identity(1,1),uname varchar(20),uage int);
　　create table test3_bak(id int primary key not
　　null identity(1,1),bid int,uname varchar(20),
　　uage int,active char(1));

　　alter trigger test3_bak_insert_update
　　on test3
　　for insert,update
　　as
　　declare @id int
　　declare @uname varchar(20)
　　declare @uage int
　　begin
　　select @id=id,@uname=uname,@uage=uage from inserted
　　if @id<>0
　　begin
　　update test3_bak set active='0' where bid=@id
　　insert into test3_bak(bid,uname,uage,active)
　　values(@id,@uname,@uage,'1')
　　end
　　end

　　insert into test3(uname,uage) values('FLB',20)
　　insert into test3(uname,uage) values('FLB1',21)
　　insert into test3(uname,uage) values('FLB2',22)
　　update test3 set uage=100 where id=27
　　delete from test3 where id=20

　　select * from test3
　　select * from test3_bak