Oracle根据字段去除表中重复数据

根据MOBILE查询SY_WXUSER表中的重复数据：

select * from SY_WXUSER
where MOBILE in (select   MOBILE from   SY_WXUSER group by   MOBILE having count (MOBILE) > 1)

根据MOBILE删除SY_WXUSER表中的重复数据：

delete from SY_WXUSER 
where MOBILE in (select   MOBILE from SY_WXUSER group by   MOBILE   having count (MOBILE) > 1) 
and rowid not in (select min(rowid) from   SY_WXUSER group by MOBILE having count(MOBILE)>1)