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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。
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  • 原文地址:https://www.cnblogs.com/pumushan/p/6655204.html
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