写了两个触发器,避免插入重复记录,及修改后形成重复记录

create   trigger trInsertTest on InsertTest  --取代插入操作的触发器
instead of insert
as
if @@rowcount=0
return

select * into #t from
(
select * from InsertTest
union
select * from inserted
) a

truncate table InsertTest

insert into InsertTest
select * from #t 

---------------------------------------------------------------------------------------------------

create   trigger trInsertTestUpdate on InsertTest  --防止更新后形成重复记录的触发器
for update
as
if @@rowcount=0
return
select * into #t from
(
select * from InsertTest
union
select * from inserted
) a

truncate table InsertTest

insert into InsertTest
select * from #t

这两个触发器只适用于表记录比较少的表,如果记录条数很多,恐怕就不合适了,应该会比较损耗性能

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