Sql server SQL:要使用尝试号更新我的表。如果表中重复某个键（键的组合）

我有一个具有以下值的表：

Enrollment_No   |S_Code  |Reg_Code |Grade|Attempt
----------------------------------------------------
2017001234      |ABC101  |1701     |B    |
2017001234      |ABC102  |1701     |F    |
2017001234      |ABC103  |1701     |C    |
2017001234      |ABC104  |1701     |B    |
2017001234      |ABC105  |1701     |D    |
2017001234      |ABC106  |1702     |A    |
2017001234      |ABC107  |1702     |B    |
2017001234      |ABC108  |1702     |C    |
2017001234      |ABC109  |1702     |D    |
2017001234      |ABC110  |1702     |B    |
2017001234      |ABC102  |1711     |C    |
2017001234      |ABC109  |1711     |C    |

我想更新（SQL查询）上面的表，如果相同的Enrollment\u no在更高的注册中重复一个S\u代码，我的最终表如下所示

Enrollment_No   |S_Code  |Reg_Code |Grade|Attempt
----------------------------------------------------
2017001234      |ABC101  |1701     |B    |1
2017001234      |ABC102  |1701     |F    |1
2017001234      |ABC103  |1701     |C    |1
2017001234      |ABC104  |1701     |B    |1
2017001234      |ABC105  |1701     |D    |1
2017001234      |ABC106  |1702     |A    |1
2017001234      |ABC107  |1702     |B    |1
2017001234      |ABC108  |1702     |C    |1
2017001234      |ABC109  |1702     |D    |1
2017001234      |ABC110  |1702     |B    |1
2017001234      |ABC102  |1711     |C    |2
2017001234      |ABC109  |1711     |C    |2

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您可以尝试使用SQL Server的

行编号（）

进行内联更新，以生成尝试的值

UPDATE x
SET x.Attempt = x.New_Attempt
FROM
(
    SELECT Attempt,
           ROW_NUMBER() OVER (PARTITION BY Enrollment_No, S_Code
                              ORDER BY Reg_Code) AS New_Attempt
    FROM yourTable
) x

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谢谢你让我开心。