Question

我需要从交集表中删除一些重复的条目。

这个表设置得非常糟糕，没有主键，所以我在删除重复的条目时遇到了一些麻烦。

以下是对该表的粗略概述：

col1    col2
------------
1       70
1       70
1       71

两个列都带有id，并且重复打破了东西。

Answer 1

您可以使用RANKING Functions

with cte as
(
select row_number() over(partition by col1,col2 order by col1,col2 )as rowNum
from tableName
)
delete from cte where rowNum>1

SQL FIDDLE DEMO

Answer 2

drop table #t
create table #t(col1 int,col2 int)
insert into #t values(1,70),(1,70),(2,71)
;with cte as
(

select [col1],[col2],rn=row_number() over(partition by col1 order by col2)  from #t
)
delete from cte where rn>1

select * from #t

DEMO

Answer 3

with t1dups (col1, coldups)
AS (      
select col2, ROW_NUMBER() Over (Partition by col1, col2 order by col2) as dups from t1 )
delete from t1dups where coldups > 1

从SQL Server表中删除重复项

3 个答案: