sql - 来自 DATEDIFF 的总计

Question

另一个简单的问题，我不知道如何解决，想知道您是否可以提供帮助。我需要总计 140 万行数据，每行有一定数量的 PitchNights，第 1 行 = 2，第 2 行 = 26，第 14000 行 = 3 等等，所以如果我只有这 3 行，那么总数将是 31。什么我需要在 2 个设定的日期之间总共有所有的 Pitch 之夜。我尝试了按功能分组，但没有奏效。

SELECT
  Bookings.BookingNumber
  ,Bookings.ArrivalDate
  ,Bookings.DepartureDate, DATEDIFF(d,Bookings.ArrivalDate
  ,Bookings.DepartureDate) AS 'PitchNights'
FROM
  Bookings
WHERE Bookings.ArrivalDate >=@ArrivalDate AND Bookings.DepartureDate <=@DepartureDate

谢谢

韦恩

Answer 1

SELECT  SUM(DATEDIFF(d,Bookings.ArrivalDate,Bookings.DepartureDate)) AS 'PitchNights'
FROM    Bookings
WHERE   Bookings.ArrivalDate >=@ArrivalDate AND 
        Bookings.DepartureDate <=@DepartureDate