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[数据库]查询并删除重复记录的SQL语句


查询及删除重复记录的SQL语句

  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)

  注:rowid为oracle自带不用该.....

  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)

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