我喜欢 CTE 和 ROW_NUMBER 因为两者结合起来让我们可以看到哪些行被删除(或更新)，因此只需更改DELETE FROM CTE... 到 SELECT * FROM CTE:

I like CTEs and ROW_NUMBER as the two combined allow us to see which rows are deleted (or updated), therefore just change the DELETE FROM CTE... to 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.Table1
)
DELETE FROM CTE WHERE RN > 1

DEMO(结果不同；我假设这是由于您的拼写错误)

DEMO (result is different; I assume that it's due to a typo on your part)

COL1    COL2    COL3    COL4    COL5    COL6    COL7
john    1        1       1       1       1       1
sally   2        2       2       2       2       2

由于 PARTITION BY col1，此示例通过单列 col1 确定重复项.如果您想包含多个列，只需将它们添加到 PARTITION BY:

This example determines duplicates by a single column col1 because of the PARTITION BY col1. If you want to include multiple columns simply add them to the PARTITION BY:

ROW_NUMBER()OVER(PARTITION BY Col1, Col2, ... ORDER BY OrderColumn)