Question

我有一个基本的查询来从表中提取服务总和：

Select Service, Sum(Qty_Sold) as Total
From Services
Where Service in ('1','2','3','4')
Group By Service

输出：

Service     Total
   1          8
   2          9
   3          22
   4          11

我最近添加了一项新服务，但我想添加一项新服务，该服务将为“7”，并将其添加到“4”服务中。所以 - 我的数据将是：

Service    Total
   1          8
   2          9
   3          22
   4          11
   7          1

但我希望我的输出为：

Service    Total
   1          8
   2          9
   3          22
   4          12

我试过了：

Select * from 
(
Select Case When Service = '7' then '4' Else Service, Sum(Qty_Sold) as Total
From Services
Where Service in ('1','2','3','4','7')
Group By Service)
Group By Services, Total

这仍然不能得到我需要的总数，它只是List的'4'两次。如何将它组合到4和7中以显示我想要的内容？

Answer 1

试试这个

SELECT
    CombinedService, SUM(Total) AS CombinedTotal
FROM
    (   SELECT 
            CASE 
                WHEN Service = '7' THEN '4'
                ELSE Service
            END AS CombinedService,
            SUM(Qty_Sold) AS Total
        FROM
            Services
        WHERE
            Service IN ('1', '2', '3', '4', '7')
        GROUP BY
            Service
    ) cs
GROUP BY
    CombinedService

Answer 2

您可以创建一个包含ServiceDescriptors＆＃39;的新表格，而不是弄乱复杂的WHERE子句：

ServiceID ServiceDesc

1 1

2 2

3 3

4 4

7 4

然后，只需基于ServiceDesc求和。当您添加新的ServiceID时，您将更加欣赏此解决方案。

HTH，Jim

Answer 3

您可以尝试使用CTE加入服务表。

WITH cte(origService, newService) AS (

    SELECT * FROM (VALUES (1, 1), (2, 2), (3, 3), (4, 4), (7, 4)) t(o, n)
)
SELECT newService AS Service, sum(Qty_Sold) AS Total
FROM cte
JOIN Services s ON s.Service = cte.origService
GROUP BY newService

如何添加SQL列的某些结果

3 个答案: