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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。版权声明：本文内容由互联网用户自发贡献，该文观点仅代表作者本人。本站仅提供信息存储空间服务，不拥有所有权，不承担相关法律责任。如发现本站有涉嫌侵权/违法违规的内容， 请发送邮件至 举报，一经查实，本站将立刻删除。
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