OVER ORDER BY中的多个列

Question

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

以上工作正常,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.

Answer 1

问题是列名称周围的额外括号.这些应该都有效:

-- 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,当您询问SQL问题时,应始终指定要查询的数据库.