删除 SQL 服务器中重复的最大行

Question

我想删除 SQL 中的重复行。我的查询可以删除 RN > 1 的重复行，但我想删除 max(RN)：

WITH CTE AS(
   SELECT [col1], [col2], [col3]
       RN = ROW_NUMBER()OVER(PARTITION BY [col1], [col2] ORDER BY [col1], [col2])
   FROM dbo.Table1
)
DELETE FROM CTE WHERE RN > 1

Answer 1

只需将分区更改为与当前顺序相反的顺序，然后只删除具有第一行号的记录：

WITH CTE AS (
    SELECT [col1], [col2], [col3]
           RN = ROW_NUMBER() OVER (PARTITION BY [col1], [col2] ORDER BY [col1] DESC, [col2] DESC)
    FROM dbo.Table1
)

DELETE FROM CTE WHERE RN = 1;