SQL SERVER DATEDIFF函数 [英] SQL SERVER DATEDIFF FUNCTION

问题描述

WHY SELECT DATEDIFF(year,'2001-12-21 00:00:00.000' , '2015-12-17 00:00:00.000') in sql server is shows me 14 instead of 13

推荐答案

您可以找到关于datediff的非常好的讨论这里！ [ ^ ]这应解决你的问题

You can find a very good discussion over datediff here![^] which should solve your problem

这是因为 DATEDIFF（YEAR，.. 不检查低于年份的单位，只减去年份，即2015-2001。

你可以检查

This is because DATEDIFF(YEAR,.. doesn't check units lower than year and just subtracts years i.e, 2015-2001 in your case.
You can check

SELECT DATEDIFF(year,'2001-12-21 00:00:00.000' , '2015-01-01 00:00:00.000')

，结果仍然会返回14.

and it will still return 14 as result.

读取了这个 DateDiff（Transact SQL） [ ^ ]



如果第一个日期改变年份则在那里说明即2001年至2002年，将计入年度总数。这就是为什么你得到14而不是13

have a read of this DateDiff (Transact SQL)[^]

it states in there if the first date then changes year i.e. from 2001 to 2002 that will be counted in the year total. that is why you get 14 instead of the 13

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