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create table table1 (sno varchar(10),sname varchar(10))
create table table2 (sno varchar(10),sname varchar(10))

go

create trigger t_table1 on table1
after delete,insert,update
as
begin
    delete from table2 where sno in (select sno from deleted)

    if not exists (select 1 from table2 a,inserted i where a.sno=i.sno)
        insert into table2
        select * from inserted
    else
        update a set a.sname=i.sname from table2 a,inserted i where a.sno=i.sno
end

go

/**********²åÈë¼Ç¼************/

insert into table1
select '0001','aa' union all
select '0002','bb' union all
select '0004','dd' 

select * from table1
select * from table2

--table1
/* 
sno     sname
-----  -------
0001    aa
0002    bb
0004    dd

--table2
sno      sname
------  -------
0001    aa
0002    bb
0004    dd
*/

/********ɾ³ý¼Ç¼*************/
delete from table1 where sno='0004'

select * from table1
select * from table2

--table1
/* 
sno     sname
-----  -------
0001    aa
0002    bb

--table2
sno      sname
------  -------
0001    aa
0002    bb
*/

/***********¸üмǼ************/
update table1 set sname='cc' where sno='0002'

select * from table1
select * from table2

--table1
/* 
sno     sname
-----  -------
0001    aa
0002    cc

--table2
sno      sname
------  -------
0001    aa
0002    cc
*/

/********ɾ³ý²âÊÔ**********/

drop table table1,table2

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