按MONTH在T-SQL中對查詢結果進行分組

Question

我正在尋找一個提示，該提示如何將我的查詢結果按MONTH和WindowsAccount 分組 ，其中月份信息來自查詢中的InsertedAt列。 如果有人能提出實現該目標的方法，我將非常感激。 預先感謝您。

 SELECT InsertedAt,
       TaskName,
       WindowsAccount,
       Start,
       Round (Time / 60.1, 2) AS Time
FROM   (SELECT CONVERT (VARCHAR(23), InsertedAt, 104) AS InsertedAt,
               Subject,
               TaskName,
               WindowsAccount,
               CONVERT (VARCHAR(23), NewStart, 104)   AS Start,
               Datediff("MINUTE", OldStart, OldEnd)   AS OldDiff,
               Datediff("MINUTE", NewStart, NewEnd)   AS Time
        FROM   History
        WHERE  ( Month(InsertedAt) IN ( 9, 10, 11 )
                 AND Year(InsertedAt) = 2015 )) AS Tab
WHERE  Tab.OldDiff <> Tab.Time
ORDER  BY InsertedAt,
          WindowsAccount

Answer 1

您可以使用DatePart函數進行分組。

作為示例（ https://msdn.microsoft.com/en-us/library/ms177673.aspx ）：

SELECT DATEPART(m,OrderDate) AS N'Month'
    ,SUM(TotalDue) AS N'Total Order Amount'
FROM Sales.SalesOrderHeader
GROUP BY DATEPART(m,OrderDate)
ORDER BY DATEPART(m,OrderDate);