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Oracle日期相减
--MONTHS_BETWEEN(date2,date1) 给出date2-date1的月份 SQL> select months_between('19-12月-1999','19-3月-1999') mon_between from dual; MON_BETWEEN ----------- 9 SQL>select months_between(to_date('2000.05.20','yyyy.mm.dd'),to_date('2005.05.20','yyyy.dd')) mon_betw from dual; MON_BETW --------- -60 Oracle计算时间差表达式 --获取两时间的相差豪秒数 select ceil((To_date('2008-05-02 00:00:00' , 'yyyy-mm-dd hh24-mi
