休眠 - 两个日期之间的差异

Question

如何计算两个日期之间的差异，以使查询与以下内容兼容：MySql，H2和SqlServer？

Answer 1

• SQL服务器 - 您可以使用DATEDIFF函数返回指定DATEPART

SELECT DATEDIFF(dd,'1/20/2014,'1/22/2014')

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

差异

• MySQL的 - DATEDIFF()只是一点点不同，

SELECT DATEDIFF('2008-11-30','2008-11-29') AS DiffDate

http://dev.mysql.com/doc/refman/5.1/en/date-and-time-functions.html#function_datediff

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• H2 - DATEDIFF

DATEDIFF('YEAR', T1.CREATED, T2.CREATED)

http://www.h2database.com/html/functions.html#datediff

Answer 2

在SQL Server -

datediff (day,startdate,enddate)