MONTHS_BETWEEN 函数的使用

最新推荐文章于 2024-10-03 20:45:00 发布

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#date #components #database #oracle #c

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本文探讨了SQL数据库中MONTHS_BETWEEN函数的使用方法，通过具体实例展示了如何计算两个日期之间的月份数。重点分析了函数的工作原理、注意事项及常见错误处理。

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返回结果为[1]的是那一项?

A.SELECT MONTHS_BETWEEN (DATE '2012-01-16', DATE '2011-12-16') FROM dual;
B.SELECT MONTHS_BETWEEN (DATE '2011-12-16', DATE '2012-01-16') FROM dual;
C.SELECT MONTHS_BETWEEN (DATE '2012-02-28', DATE '2012-01-31') FROM dual;
D.SELECT MONTHS_BETWEEN (DATE '2012-05-15', DATE '2012-04-16') + 1/31 FROM dual;

结果为:AD

备注:

MONTHS_BETWEEN returns number of months between two dates, and is called as follows:
MONTHS_BETWEEN (date1, date2)
1.If date1 is later than date2, then the result is positive. If date1 is earlier than date2, then the result is negative.
2.If date1 and date2 are either the same days of the month or both last days of months, then the result is always an integer. Option C,because 2012 is a leap year, so February has 29 days.
3.Otherwise Oracle Database calculates the fractional portion of the result based on a 31-day month and considers the difference in time components of date1 and date2.