sql 删除表中的重复记录

2017-02-18 16:54:15 SQLserver
本文主要介绍了sql 删除表中的重复记录的方法,具有一定的参考价值,下面跟着小编一起来看下吧

遇见了表中存在重复的记录的问题,直接写sql删除时最快的,才不要慢慢的复制到excel表中慢慢的人工找呢

如下sql,找出重复的记录,和重复记录中ID值最小的记录(表中ID为自增长)

select MIN(ID) as id, StructSN ,Date,UserID,StarCount,COUNT(StructSN) as c
from T_Dor_StructStar 
where Date >= '20160919'
group by StructSN ,Date,UserID,StarCount
having COUNT(StructSN) > 1
然后就可以直接删除,基本原理就是,找到重复记录的每一条记录,排除掉重复id最小的记录,删除剩余的重复记录。
delete from T_Dor_StructStar
where ID in (
select s.ID from T_Dor_StructStar s,
(
select MIN(ID) as id, StructSN ,Date,UserID,StarCount,COUNT(StructSN) as c
from T_Dor_StructStar 
where Date >= '20160919'
group by StructSN ,Date,UserID,StarCount
having COUNT(StructSN) > 1
)a
where
a.Date = s.Date
and a.StructSN = s.StructSN
and a.UserID = s.UserID
and a.StarCount = s.StarCount
and a.id != s.ID
)

上面就是这篇文章的全部内容,希望本文的内容对大家的学习或者工作能带来一定的帮助!

原文链接:http://www.cnblogs.com/yucaoye/p/6255691.html