如何根据行总和计算值以获取值

Question

我有一个C＃应用程序，用于从SQL数据库导出数据。它从视图中提取数据并将其导出到Excel以导入到我们的工资单系统。我需要计算加班金额。我有以下代码，但它不计算加班的数量。我在互联网上搜索了一个解决方案，但没有任何运气。

SELECT  [Co Code]
    , [Empl No]
    , [Task CD]
    , [Day No]
    , [Fund Co Code]
    , [Job No]
    , [Equip Cost Cde]
    , SUM([Reg Hrs Jc]) AS [Reg Hrs Jc]
    ,(CASE WHEN [Reg Hrs Jc] > 40 THEN [Reg Hrs Jc] - 40 ELSE 0 END) AS [Ot Hrs Jc]
FROM         dbo.MIS_FTTIMECARD_OT
WHERE     ([Date Worked] BETWEEN '8/11/2013' AND '8/17/2013')
GROUP BY [Co Code]
    , [Empl No]
    , [Task CD]
    , [Day No]
    , [Fund Co Code]
    , [Job No]
    , [Equip Cost Cde]
    , (CASE WHEN [Reg Hrs Jc] > 40 THEN [Reg Hrs Jc] - 40 ELSE 0 END)

Answer 1

您应该使用子查询，这将允许您首先总结工作时间：

SELECT t.*, (CASE WHEN [Reg Hrs Jc] > 40 THEN [Reg Hrs Jc] - 40 ELSE 0 END) AS [Ot Hrs Jc]
FROM 
   (SELECT [Co Code], [Empl No], [Task CD], [Day No], [Fund Co Code], [Job No], [Equip Cost Cde], SUM([Reg Hrs Jc]) AS [Reg Hrs Jc] FROM dbo.MIS_FTTIMECARD_OT
   WHERE ([Date Worked] BETWEEN '8/11/2013' AND '8/17/2013')
   GROUP BY [Co Code], [Empl No], [Task CD], [Day No], [Fund Co Code], [Job No], [Equip Cost Cde]) AS t

Answer 2

为了扩展其他人的答案，你的命名惯例可能会导致混淆。

考虑以下代码片段：

, SUM([Reg Hrs Jc]) AS [Reg Hrs Jc]
,(CASE WHEN [Reg Hrs Jc] > 40 THEN [Reg Hrs Jc] - 40 ELSE 0 END) AS [Ot Hrs Jc]

通过重命名，可以清楚地知道发生了什么：

, SUM([Reg Hrs Jc]) AS [Reg Hrs Jc Sum]
,(CASE WHEN [Reg Hrs Jc] > 40 THEN [Reg Hrs Jc] - 40 ELSE 0 END) AS [Ot Hrs Jc]

我认为您已经有效地尝试执行以下操作，如果它没有共享实际的列名，则无法正常工作

, SUM([Reg Hrs Jc]) AS [Reg Hrs Jc Sum]
,(CASE WHEN [Reg Hrs Jc Sum] > 40 THEN [Reg Hrs Jc Sum] - 40 ELSE 0 END) AS [Ot Hrs Jc]

你不能昵称一个列，然后用同一范围内的新标题引用它，所以你应该像其他人建议的那样将Ot Hrs Jc建立在SUM（[Reg Hrs Jc]）上。