SQL语句删除表中重复字段

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 peopleIdin (select peopleIdfrom peoplegroup 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

 deletefrom people

 where peopleIdin (select peopleIdfrom peoplegroup by peopleId having count(peopleId) > 1)

 and rowid not in (select min(rowid)from peoplegroup 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,seqfrom vitaegroup 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

 deletefrom vitae a

 where (a.peopleId,a.seq)in (select peopleId,seqfrom vitaegroup by peopleId,seq having count(*) > 1)

 and rowid not in (select min(rowid)from vitaegroup 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,seqfrom vitaegroup by peopleId,seq having count(*) > 1)

 and rowid not in (select min(rowid)from vitaegroup by peopleId,seq having count(*)>1)

  

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