求教高手指教一个触发器如何写

create tr_ins_tab1 on tab1
after insert
as
begin

    update tab2 set times = times +1  
    from tab2 a inner join inserted b on a.name1 = b.name1 and a.name2= b.name2

    insert into tab2
    select a.name1,a.name2,1 from inserted a where not exists (select 1 from tab2 b a.name1 = b.name1 and a.name2= b.name2
)

end

------解决方案--------------------

SQL code

CREATE TRIGGER trg_test
ON tb1 FOR INSERT  
AS
    DECLARE @name1 VARCHAR(10),@name2 varchar(10)
    SELECT @name1=name1,@name2=name2 FROM INSERTED 
    IF EXISTS(SELECT 1 FROM tb2 WHERE name1=@name1 AND name2=@name2)
    BEGIN
        UPDATE tb2 SET times=times+1 WHERE name1=@name1 AND name2=@name2
    END
    ELSE
    BEGIN
        INSERT INTO tb2(name1,name2,times) VALUES(@name1,@name2,1)
    END

------解决方案--------------------

探讨

请教高手，我现在要实现这么一个功能：

表1：有字段 name1,name2.就是记录两个人名

表2:也是有字段name1,name2,times，那个times是指次数。

我想在表1里面写个触发器，当给表1插入新数据时候，判断一下，新数据里面的name1,name2在表2的name1,name2是否存在,如果存在，则原有times+1,如果没有，则 times = 1


……

------解决方案--------------------

SQL code

go
if object_id('tri_test')is not null
drop trigger tri_test
go
create trigger tri_test on 表1
for insert
as
if exists(select 1 from inserted i where 
not exists(select 1 from t2 t where t.name1=i.name and t.name2=i.name2))
begin
update t2 set times=times+1
where name1 in(select name1 from inserted)
and name2 in(select name2 from inserted)
end