关于SQL Server中的删除命令

Question

如何从表中删除重复的行？

Answer 1

我喜欢CTE和ROW_NUMBER，因为它允许轻松更改它以查看哪些行被删除（或更新），因此只需将DELETE FROM CTE ...更改为SELECT * FROM CTE：

;WITH CTE AS (
    SELECT [col1],
           [col2],
           [col3],
           [col4],
           [col5],
           [col6],
           [col7],
           RN = ROW_NUMBER() OVER (PARTITION BY col1 ORDER BY col1)
    FROM dbo.table
)
DELETE FROM CTE
WHERE RN > 1

试试这个