oracle sql 获取本季度全部月份，上季度全部月份

上季度全部月份：sql SELECT TO_CHAR(ADD_MONTHS(ADD_MONTHS(TRUNC(SYSDATE, 'YYYY'),A * 3),-ROWNUM),'YYYYMM') LAST_Q FROM (SELECT TO_CHAR(SYSDATE,'Q')-1 A FROM DUAL) CONNECT BY ROWNUM <= 3 ORDER BY 1

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