如何按照與午夜不同的時間開始分組？

Question

如果可能的話，我希望在一個聲明中這樣做。

我原來的查詢是這樣的：

SELECT CAST(Date as DATE) as DayDate, SUM(Books) as LostBooks 
FROM RestartBooksView 
WHERE Name = 'AUHT167' and Date > (getdate() - 105) 
GROUP BY CAST(Date as DATE) 
ORDER BY CAST(Date as DATE) ASC 

與此查詢的問題是，我想求和由上午七時至7時的一天，而不是目前的12點至12點的一天得到體現。如何修改我的查詢以反映此更改？

Answer 1

假設列「日期」實際上是一個日期時間。

SELECT CAST(Date as DATE) as DayDate, SUM(Books) as LostBooks 
FROM (select rbv.*, 
      cast(dateadd(h, -7, date) as date) as newdate 
     from RestartBooksView rbv 
    ) 
WHERE Name = 'AUHT167' and newdate > (getdate() - 105) 
GROUP BY newdate 
ORDER BY CAST(Date as DATE) ASC 

我也使用SQL Server日期函數，因爲您似乎正在使用該數據庫。