获取Oracle中两个日期之间的天数，包括日期 [英] Get the number of days between two dates in Oracle, inclusive of the dates

问题描述

我想获取两个提供的日期之间的总天数.我已经尝试了以下查询，但并没有完全不同；最后日期不包括在内.

I want to get total number of days between two provided dates. I've tried the below query but didn't get the exact different; the last date is not being included.

select (to_date ('15-06-13','dd-MM-yyyy') - to_date('01-02-12','dd-MM-yyyy')) 
  from dual

这应该返回501天，但是它返回了500天.如果我在计算后加+1，那么我会得到正确的结果.

This should return 501 days but it is returning 500 days instead. If I add +1 after calculation, then I'm getting the correct result.

我真的需要包含+1还是要获得实际结果的替代方法?

Do I really need to include +1 or is there an alternate approach to get the actual result?

推荐答案

在Oracle中，减去两个日期将返回两个日期之间的天数.
minus运算符的工作方式与数字相同:

In Oracle substracting two dates returns the number of days between two dates.
A minus operator works in the same way as for numbers:

20 - 20 = 0   ===>      2013-05-20  -  2013-05-20 = 0
25 - 20 = 5   ===>      2013-05-25  -  2013-05-20 = 5

如果要包含last number或last date，则需要添加1:

If you want to include last number or last date, you need to add 1:

20 - 20 + 1 = 1   ===>      2013-05-20  -  2013-05-20  + 1 = 1
25 - 20 + 1 = 6   ===>      2013-05-25  -  2013-05-20  + 1 = 6

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