尝试使用基于sql server中的2列的标识进行查询

Question

这是我目前的数据

FileNumber | Type | PerYear | PerMonth
L200200      Boat   2013      1
L303000      Boat2  2013      1
L400400      Yack   2013      2
L500500      Comp   2013      2
L600600      Item   2013      3
...
L909000      Chair  2014      1
X900220      Battle 2014      2

我希望有一个基于PerYear和PerMonth的Identity(计数器)列的查询这是我想要的结果

 KindOFIdentity FileNumber | Type | PerYear | PerMonth
 1              L200200      Boat   2013      1
 1              L303000      Boat2  2013      1
 2              L400400      Yack   2013      2
 2              L500500      Comp   2013      2
 3              L600600      Item   2013      3
 4 ...
 5 ...
 6 ...
 7 ...
 8 ...
 9 ...
 10 ...
 11 ...
 12 ... 
 13             L909000      Chair  2014      1
 14             X900220      Battle 2014      2

下面的查询不会给我正确的结果.

Select ROW_NUMBER() over (partition by PerYear,PerMonth order by PerYear, PerMonth) AS KindOFIdentity, Type, PerYear, PerMonth
from MyTable

Answer 1

使用DENSE_RANK()不带PARTITION条款,

SELECT *other columns*, DENSE_RANK() OVER (ORDER BY PerYear, PerMonth) FROM dbo.MyTable;