Sql 删除同一表中的重复字段

我编写此查询是为了显示从外部源自动填充的表中的一组名称：

select MAX(UN_ID) as [ID] , MAX(UN_Name) from UnavailableNames group by (UN_Name) 

我有很多重复的名字，所以我使用了“分组依据”

我想在执行此select查询后立即删除所有重复项。。 （删除字段UN_名称两次可用的位置，保留一次）

---

有什么方法可以做到这一点吗？

像这样的方法应该可以：

WITH CTE AS 
(
    SELECT rn = ROW_NUMBER() 
                OVER( 
                  PARTITION BY UN_Name
                  ORDER BY UN_ID ASC), * 
    FROM dbo.UnavailableNames
) 
DELETE FROM cte 
WHERE  rn > 1 

基本上，在共享相同“un_名称”的每个组中，分配一个递增的“行号”

---

然后，您只需删除“row number”大于1的所有行，并保留所有最先出现的行。

类似的操作应该可以：

WITH CTE AS 
(
    SELECT rn = ROW_NUMBER() 
                OVER( 
                  PARTITION BY UN_Name
                  ORDER BY UN_ID ASC), * 
    FROM dbo.UnavailableNames
) 
DELETE FROM cte 
WHERE  rn > 1 

With CTE As
(
Select uid,ROW_NUMBER() OVER( PARTITION BY uname order by uid) as rownum
From yourTable

)

Delete 
From yourTable
where uid in (select uid from CTE where rownum> 1 )

基本上，在共享相同“un_名称”的每个组中，分配一个递增的“行号”

---

然后，您只需删除“row number”大于1的所有行，并保留所有最先出现的行。

可能是的，呵呵，重复的可能是的，呵呵，重复的

With CTE As
(
Select uid,ROW_NUMBER() OVER( PARTITION BY uname order by uid) as rownum
From yourTable

)

Delete 
From yourTable
where uid in (select uid from CTE where rownum> 1 )