q_2372030362的博客

oracle时间的sql1.某一天的24小时写法1：select (trunc(to_date('2013-07-01', 'yyyy-mm-dd')) + trunc(to_char(to_date('2020-07-01', 'yyyy-mm-dd'), 'sssss') / 1800) / 48) + (ROWNUM - 1) / 48 as dates from dualCONNECT BY ROWNUM <= (to_date('2013-07-02', 'yyyy-mm-..

直接上比较结果：一.关于时间函数：1.上月的今天：oracleSELECT add_months(sysdate,-1) from DUALpgsqlselect (date_trunc('day', current_date - interval '0' day) + INTERVAL '-1 MONTH') lasttoday上月今天的当前时刻select to_char(now() + INTERVAL '-1 MONTH', 'YYYY-MM-DD HH24:

获取本年到当前时间的月份select to_char(add_months(sysdate, -t.rn), 'yyyymm') from dual a, (select rownum - 1 rn from dual connect by rownum <= 12) twhere to_char(add_months(sysdate, -t.rn), 'yyyy') = ...