Question

说我有一张如下表：

PK Code Value
1  A    200
2  A    300
3  A    25
4  A    75
5  A    50
6  A    15
7  A    300
8  A    75

我如何获得代码= A的前4个最高值的值（即只想要300 + 300 + 200 + 75的总和）

由于

Answer 1

您可以使用派生表或公用表表达式获得前4个SUM。

SELECT SUM(Value) As Top4Sum
FROM
(
    SELECT TOP (4) Value
    FROM YourTable
    WHERE Code = 'A'
    ORDER BY Value DESC
) T

如果您希望每SUM TOP 4 Code，那么

;WITH CTE
     AS (SELECT *,
                ROW_NUMBER() OVER (PARTITION BY Code ORDER BY Value DESC) RN
         FROM   YourTable)
SELECT Code,
       SUM(Value)
FROM   CTE
WHERE  RN <= 4
GROUP  BY Code

MAX的总和（TOP x）

1 个答案: