OVER ORDER BY 中的多个列

Posted 2023-02-16

【中文标题】OVER ORDER BY 中的多个列

【英文标题】：Multiple columns in OVER ORDER BY

【发布时间】：2012-07-26 07:45:42

【问题描述】：

有没有办法在 OVER ORDER BY 子句中指定多个列？

SELECT ROW_NUMBER() OVER(ORDER BY (A.Col1)) AS ID FROM MyTable A

上面的工作正常，但尝试添加第二列不起作用。

SELECT ROW_NUMBER() OVER(ORDER BY (A.Col1, A.Col2)) AS ID FROM MyTable A

',' 附近的语法不正确。

【参考方案1】：

问题是列名周围有多余的括号。这些都应该有效：

-- The standard way
SELECT ROW_NUMBER() OVER(ORDER BY A.Col1) AS ID FROM MyTable A
SELECT ROW_NUMBER() OVER(ORDER BY A.Col1, A.Col2) AS ID FROM MyTable A

-- Works, but unnecessary
SELECT ROW_NUMBER() OVER(ORDER BY (A.Col1), (A.Col2)) AS ID FROM MyTable A

此外，当您提出 SQL 问题时，您应该始终指定要查询的数据库。

【参考方案2】：

没有括号。

SELECT ROW_NUMBER() OVER(ORDER BY A.Col1, A.Col2) AS ID FROM MyTable A