上季度所有月份：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;  本季度所有月份：SELECT TO_CHAR(ADD_MONTHS(ADD_MONTHS(TRUNC(SYSDATE, 'YYYY'),A * 3),-ROWNUM),'YYYYMM')  LAST_Q      FROM (SELECT TO_CHAR(SYSDATE,'Q') A FROM DUAL)      CONNECT BY ROWNUM <= 3      ORDER BY 1;