几种查找和删除重复记录的方法

Question

几种查找和删除重复记录的方法

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

1. select * from people
3. where peopleId in (select peopleId from people group by peopleId having count(peopleId) > 1)

复制代码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

2. delete from people
4. where peopleId in (select peopleId from people group by peopleId having count(peopleId) > 1)
6. and rowid not in (select min(rowid) from people group by peopleId having count(peopleId )>1)

复制代码3、查找表中多余的重复记录（多个字段）

1. select * from vitae a
3. where (a.peopleId,a.seq) in (select peopleId,seq from vitae group by peopleId,seq having count(*) > 1)

复制代码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

1. delete from vitae a
3. where (a.peopleId,a.seq) in (select peopleId,seq from vitae group by peopleId,seq having count(*) > 1)
5. and rowid not in (select min(rowid) from vitae group by peopleId,seq having count(*)>1)

复制代码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

1. select * from vitae a
3. where (a.peopleId,a.seq) in (select peopleId,seq from vitae group by peopleId,seq having count(*) > 1)
5. and rowid not in (select min(rowid) from vitae group by peopleId,seq having count(*)>1)

复制代码