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，当您询问SQL问题时，应始终指定要查询的数据库。

Answer 2

没有括号。

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

Answer 3

这不可能你可以看到Row_Num的语法：

ROW_NUMBER ( ) 
    OVER ( [ PARTITION BY value_expression , ... [ n ] ] order_by_clause )

如果你在小组中提交额外的订单，你可以这样做..

OVER ORDER BY中的多个列

3 个答案: