一个表,有多条数据重复(部分字段不重复),怎么删掉重复的只留一条?

发布网友发布时间：2022-04-08 21:36

共4个回答

热心网友时间：2022-04-08 23:05

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 peopleName in (select peopleName from people group by peopleName having count(peopleName) > 1) and peopleId not in (select min(peopleId) from people group by peopleName having count(peopleName)>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)
6.消除一个字段的左边的第一位：
update tableName set [Title]=Right([Title],(len([Title])-1)) where Title like '村%'
7.消除一个字段的右边的第一位：
update tableName set [Title]=left([Title],(len([Title])-1)) where Title like '%村'
8.假删除表中多余的重复记录（多个字段），不包含rowid最小的记录 update vitae set ispass=-1 where peopleId in (select peopleId from vitae group by peopleId,seq having count(*) > 1) and seq in （select 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)

追问乱了点，没看懂
谢谢了

热心网友时间：2022-04-09 00:23

office2007以上版本都有去重复的功能键你可以直接使用

热心网友时间：2022-04-09 01:58

你傻啊，你的落户日期和地址不同，那么就说明你这些数据是不相同的数据，你只想随便留一条，SQL怎么知道你想留那条，给你个建议你先用统计功能找出重复了，然后自己选择要删除的。追问满意答案

热心网友时间：2022-04-09 03:49

delete from table where 车架号=“重复的车架号”追问这样的话把重复的都删掉，达不到留一条的效果吧

追答这个帖子有你想知道的东西