问题
Is there a way to specify multiple columns in the OVER ORDER BY clause?
SELECT ROW_NUMBER() OVER(ORDER BY (A.Col1)) AS ID FROM MyTable A
The above works fine, but trying to add a second column does not work.
SELECT ROW_NUMBER() OVER(ORDER BY (A.Col1, A.Col2)) AS ID FROM MyTable A
Incorrect syntax near ','.
回答1:
The problem is the extra parentheses around the column name. These should all work:
-- 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
Also, when you ask an SQL question, you should always specify which database you are querying against.
回答2:
No brackets.
SELECT ROW_NUMBER() OVER(ORDER BY A.Col1, A.Col2) AS ID FROM MyTable A
回答3:
this not possible
you can see syntax of Row_Num :
ROW_NUMBER ( )
OVER ( [ PARTITION BY value_expression , ... [ n ] ] order_by_clause )
if use extra order by filed in group by you can do it..
来源：https://stackoverflow.com/questions/11691046/multiple-columns-in-over-order-by