日期時間差異轉換

Question

DateTime1： 2010-11-23 15:30:00.000

DateTime2： 2010-11-23 18:30:00.000

DateTime2-DateTime1應該為03:00:00

但是當我使用下面的查詢

SELECT (EndTime - StartTime) as Hour From [Day]

它返回

1900-01-01 03:00:00.000

我怎樣才能像03:00一樣得到它？

Answer 1

如您所說， DATEDIFF是合適的。 格式化最好留給客戶端，但是以下內容將按照您的要求工作

DECLARE @Start DATETIME = '20120716 09:00',
        @End DATETIME = '20120717 12:00'

SELECT  CASE WHEN DATEDIFF(HOUR, @Start, @End) < 10 THEN '0' ELSE '' END + CAST(DATEDIFF(HOUR, @Start, @End) AS VARCHAR) + ':' + 
        RIGHT('0' + CAST(DATEDIFF(MINUTE, @Start, @End) - (DATEDIFF(HOUR, @Start, @End) * 60) AS VARCHAR), 2) [Difference]

Answer 2

Datediff函數適用於此操作。

SELECT DATEDIFF ( hour , StartTime, EndTime ) as hour From [Day]

看看http://msdn.microsoft.com/en-us/library/ms189794.aspx