SQLSERVER 删除重复记录

1、查找表中多余的重复记录，重复记录是根据单个字段（peopleId）来判断

select 

* from people

where peopleId in (select peopleId from 

people group by peopleId having count(peopleId) 

> 1) 

2、删除表中多余的重复记录，重复记录是根据单个字段（peopleId）来判断，只留有rowid最小的记录

delete 

from people

where peopleId in (select peopleId from 

people group by peopleId having 

count(peopleId) > 1)

and rowid not in (select min(rowid) from 

people group by peopleId having count(peopleId 

)>1)

3、查找表中多余的重复记录（多个字段）

select * from vitae a

where (a.peopleId,a.seq) 

in (select peopleId,seq from vitae group by peopleId,seq having 

count(*) > 1)

4、删除表中多余的重复记录（多个字段），只留有rowid最小的记录

delete from vitae a

where 

(a.peopleId,a.seq) in (select peopleId,seq from vitae group by 

peopleId,seq having count(*) > 1)

and rowid not in (select min(rowid) from 

vitae group by peopleId,seq having count(*)>1)

5、查找表中多余的重复记录（多个字段），不包含rowid最小的记录

select * from vitae a

where 

(a.peopleId,a.seq) in (select peopleId,seq from vitae group by 

peopleId,seq having count(*) > 1)

and rowid not in (select min(rowid) from 

vitae group by peopleId,seq having count(*)>1)

(二)

比方说

在A表中存在一个字段“name”，

而且不同记录之间的“name”值有可能会相同，

现在就是需要查询出在该表中的各记录之间，“name”值存在重复的项；

Select 

Name,Count(*) From A Group By Name Having Count(*) > 1

如果还查性别也相同大则如下:

Select Name,sex,Count(*) From A Group By Name,sex Having 

Count(*) > 1