删除重复数据

 

 介绍两种删除重复行的方式

1.使用临时表，分组找出重复部分的id进行删除

删除table：goods_info 中存在重复goods_id的记录

select identity(int,1,1) as autoId,* into #temptable from goods_info
select min(autoId) as autoid into #temptable1 from #temptable group by goods_id --分组找出autoId
delete from #temptable where autoId in (select autoId from #temptable1)

 

2.使用分析函数删除

With t as

(
 select  *, row_number() over (partition by ...  order by   ...) as RowNum    from table_a

)
Delete from t   where rownum > 1;