分享--针对重复记录的几个实用的SQL语法
在对数据进行分析处理时，有时候会遇到要处理重复记录的问题，下面分享下针对重复记录的几个SQL语法。
http://www.powerbibbs.com/thread-184-1-1.html

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) 




------解决方案--------------------
这个以前大版整理过了

http://topic.csdn.net/u/20080626/00/43d0d10c-28f1-418d-a05b-663880da278a.html?82976
------解决方案--------------------
不错。。
------解决方案--------------------

探讨

在对数据进行分析处理时，有时候会遇到要处理重复记录的问题，下面分享下针对重复记录的几个SQL语法。
http://www.powerbibbs.com/thread-184-1-1.html

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 f……

------解决方案--------------------

探讨

在对数据进行分析处理时，有时候会遇到要处理重复记录的问题，下面分享下针对重复记录的几个SQL语法。
http://www.powerbibbs.com/thread-184-1-1.html

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 f……