比如1月份 显示123,2月份显示123,4月份显示456
range(ceiling(month(today())/3)*3-2,ceiling(month(today())/3)*3)
SELECT TO_CHAR(ADD_MONTHS(ADD_MONTHS(TRUNC(SYSDATE, 'YYYY'), A * 3),
-ROWNUM),'MM') 月份
FROM (SELECT TO_CHAR(SYSDATE, 'Q') A FROM DUAL)
CONNECT BY ROWNUM <= 3
ORDER BY 1