DATENAME未与Group By

Question

我有一个SQL查询，可以按预期返回数据：

 SELECT intMonth as Month
, intYear AS Year,
Sum([intExposureHours]) as [Total Hours]
  FROM tblSSQReleaseToMajor RTM 
  INNER JOIN tblCompany C On RTM.CompanyID = C.CompanyID
    AND C.bitActive = 1 
  INNER JOIN [tblIncidentDetailByOperatorByMonth] BM ON RTM.MajorID = BM.OperatorID
    AND BM.ContractorID = RTM.CompanyID 
        AND BM.OperatorID = 47792
    AND BM.intYear = 2017
        Group By intMonth, intYear

但是，当我尝试将数字月份更改为月份名称时，如下所示：

SELECT DateName(month,intMonth) as Month
, intYear AS Year,
Sum([intExposureHours]) as [Total Hours]
  FROM tblSSQReleaseToMajor RTM 
  INNER JOIN tblCompany C On RTM.CompanyID = C.CompanyID
    AND C.bitActive = 1 
  INNER JOIN [tblIncidentDetailByOperatorByMonth] BM ON RTM.MajorID = BM.OperatorID
    AND BM.ContractorID = RTM.CompanyID 
        AND BM.OperatorID = 47792
    AND BM.intYear = 2017
        Group By intMonth, intYear

我明白了：

更改＆＃34; Group By＆＃34;条款为＆＃34; Group By DateName(month,intMonth), intYear＆＃34;

产生这个：

有谁能告诉我为什么我没有得到一月，二月，三月，四月五月？

非常感谢任何帮助！

Answer 1

DATENAME仅适用于实际日期。你必须做一些hacky才能让它发挥作用。

SELECT DATENAME(month, DATEADD(month, intMonth - 1, CAST('2017-01-01' AS DATETIME))) as Month
, intYear AS Year,
Sum([intExposureHours]) as [Total Hours]
  FROM tblSSQReleaseToMajor RTM 
  INNER JOIN tblCompany C On RTM.CompanyID = C.CompanyID
    AND C.bitActive = 1 
  INNER JOIN [tblIncidentDetailByOperatorByMonth] BM ON RTM.MajorID = BM.OperatorID
    AND BM.ContractorID = RTM.CompanyID 
        AND BM.OperatorID = 47792
    AND BM.intYear = 2017
        Group By intMonth, intYear

编辑：抱歉，要回答您为何会出现这种情况的问题，请尝试以下问题：

SELECT CAST(1 AS DATETIME) -- 1900-01-02 00:00:00.000
SELECT CAST(42919 AS DATETIME) -- is today, the 42,919th day since January 1, 1900

SQL Server实际上将日期存储为整数。当您将“1”作为日期时，它会将其视为“1900-01-02 00：00：00.000”。因此，它表示所有结果的月份是1月份，因为您输入的数字为1-12。它认为你说的是​​1900年1月2日至13日。这就是为什么它为每个人抓一月份的原因。