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标题: ORACLE中函数MONTHS_BETWEEN的使用 [打印本页]

作者: 张兴康 时间: 2020-3-19 16:27
标题: ORACLE中函数MONTHS_BETWEEN的使用
格式：MONTHS_BETWEEN(DATE1,DATE2)

MONTHS_BETWEEN函数返回两个日期之间的月份数。
SQL> select months_between(to_date('20090228', 'yyyymmdd'), to_date('20080228', 'yyyymmdd')) as months from dual;

   MONTHS
----------
      12

SQL> select months_between(to_date('20090228', 'yyyymmdd'), to_date('20080229', 'yyyymmdd')) as months from dual;

   MONTHS
----------
      12

SQL> select months_between(to_date('20080229', 'yyyymmdd'), to_date('20070228', 'yyyymmdd')) as months from dual;

   MONTHS
----------
      12

SQL> select months_between(to_date('20100331', 'yyyymmdd'), to_date('20100228', 'yyyymmdd')) as months from dual;

   MONTHS
----------
      1

SQL> select months_between(to_date('20100228', 'yyyymmdd'), to_date('20100128', 'yyyymmdd')) as months from dual;

   MONTHS
----------
      1

SQL> select months_between(to_date('20100327', 'yyyymmdd'), to_date('20100228', 'yyyymmdd')) as months from dual;

   MONTHS
----------
.967741935

SQL> select months_between(to_date('20100330', 'yyyymmdd'), to_date('20100228', 'yyyymmdd')) as months from dual;

   MONTHS
----------
1.06451613

SQL> select months_between(to_date('20100228', 'yyyymmdd'), to_date('20100130', 'yyyymmdd')) as months from dual;

   MONTHS
----------
.935483871

SQL> select months_between(to_date('20100228', 'yyyymmdd'), to_date('20100131', 'yyyymmdd')) as months from dual;

   MONTHS
----------
      1

SQL> select months_between(to_date('20100228', 'yyyymmdd'), to_date('20100127', 'yyyymmdd')) as months from dual;

   MONTHS
----------
1.03225806

30/31=0.96774193548387096774193548387097
33/31=1.0645161290322580645161290322581
29/31=0.93548387096774193548387096774194
32/31=1.032258064516129032258064516129
在ORACLE中计算月份的差值，都是月底或是日期相同，都会按整月计算。
如果计算结果不是整数，ORACLE会把31作为分母来计算。

作者: 张兴康 时间: 2020-3-19 16:27

作者: fteair 时间: 2020-3-19 17:37

作者: 张兴康 时间: 2020-3-20 17:02

fteair 发表于 2017-4-19 17:37

作者: fteair 时间: 2020-3-21 17:17

作者: 张兴康 时间: 2020-3-24 18:04

fteair 发表于 2017-4-21 17:17

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