三种:
1.delete from table1 a where rowid not in(
select max(rowid) from table1 b group by (去重字段));
2.delete from table1 a where rowid !=(
select max(rowid) from table b where a.name=b.name and b.sex=a.sex );
3.insert into tem_tab select distinct mobile from old_tab;
drop table old_tab;
rename tem_tab to old_tab;
4.delete from table1 where rowid in(
select rowid from (
select rowid,deptno,name,age, row_number() over(partition by deptno order by age desc) rn from emp_zh)where rn>1);---分组去重
oracle 去重sql
猜你喜欢
转载自qnzhl.iteye.com/blog/2201628
今日推荐
周排行