oracle去重

1.oracle查找表中的重复数据

   select testid,count(1)

   from table

   group by testid

   having count(1)>1；

   testid 标签号

2.去重

   detele from tab_name a

   where col1,col2 in(

                                select col1,

                                col2

                                from tab_name

                                group by col1,col2

                                having count(*)>1);