利用Oracle的row_number() over函数消除重复的记录

1.select d.id,d.outer_code from  dict_depts_source d order by outer_code(查看重复数据)

2.select d.id,d.outer_code,row_number() over(partition by outer_code order by outer_code) row_flag from  dict_depts_source d(标识重复数据)

3.delete from dict_depts_source where id in(
  select id from(select d.id,d.outer_code,row_number() over(partition by outer_code order by outer_code) row_flag from  dict_depts_source d)t
  where t.row_flag > 1)(删除重复数据)

4.select d.id,d.outer_code,row_number() over(partition by outer_code order by outer_code) row_flag from  dict_depts_source d(检查删除效果)

 本文转自:http://blog.itpub.net/11320622/viewspace-675648/