Oracle里删除重复记录，保留一项
我们在使用数据库的时候，有时数据会有所重复，当我们只需要一项数据时，不需要显示重复的记录时
如下就有SQL代码：
1 --查找表中多余的重复记录，重复记录是根据单个字段来判断 2 select * from people where peopleId in(select peopleId from people group by peopleId 3 having count(peopleId)>1); 4 5 --删除表中多余的重复记录，重复记录是根据单个字段来判断，只保留rowid最小的记录 6 delete from people where peoplename in(select peoplename from people group by peoplename having count(peoplename)>1) 7 and peopleId not in (select min(peopleId) from people group by peoplename having count(peoplename)>1); 8 9 --查找表中多余的重复记录（多个字段） 10 select * from vitae a 11 where (a.peopleId,a.seq) in (select peopleId,seq from vitae group by peopleId,seq having count(*)>1); 12 13 --删除表中多余的重复记录（多个字段），只保留rowid最小的记录 14 delete from vitae a 15 where (a.peopleId,a.seq) in (select peopleId,seq from vitae group by peopleId,seq having count(*)>1) 16 and rowid not in(select min(rowid) from vitae group by peopleId,seq having count(*)>1);
