如何在SQL Server 2005中减去两个日期时间值

Question

我有两个日期值：08/6/2009 00:00:00和10/6/2009 23:59:59。

如何在SQL Server 2005中查询查询的小时数？

Answer 1

SELECT  DATEDIFF(hour, '2009-08-06 00:00:00', '2009-10-06 23:59:59')

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 71

Answer 2

DATEDIFF(HOUR,'08/6/2009 00:00:00','10/6/2009 23:59:59')