sql查询删除重复数据

数据库UserInfo

删除重复数据即删除重复的用户名手机号同一个用户名手机号只保留一个用户

01、根据多个字段查询重复数据

with data1 as(

select MobilePhone,Name from UserInfo
group by MobilePhone,Name
having count(*)>1

02、对重复数据分配编号

data2 as (

select u.*,row_number() over(partition by u.MobilePhone,u.Name order by Id ) rowNum from UserInfo u
inner join data1 d on u.Name=d.Name and u.MobilePhone=d.MobilePhone

03、查询需要删除数据的主键（每个小组里的编号为一的保留其它删除）

data3 as(

select Id from data2 where rowNum>1

)

04、根据主键删除数据

delete from UserInfo
where Id in (select Id from data3)

删除后

附 sqlserver中分区函数partition by的用法 http://www.cnblogs.com/zhangchengye/p/5473860.html

时间： 2024-10-11 22:09:01

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