[Oracle] 오라클 달력출력

SELECT MIN (DECODE (TO_CHAR (DAYS, 'D'), 1, TO_CHAR (DAYS, 'FMDD'))) AS SUN,
         MIN (DECODE (TO_CHAR (DAYS, 'D'), 2, TO_CHAR (DAYS, 'FMDD'))) AS MON,
         MIN (DECODE (TO_CHAR (DAYS, 'D'), 3, TO_CHAR (DAYS, 'FMDD'))) AS TUE,
         MIN (DECODE (TO_CHAR (DAYS, 'D'), 4, TO_CHAR (DAYS, 'FMDD'))) AS WED,
         MIN (DECODE (TO_CHAR (DAYS, 'D'), 5, TO_CHAR (DAYS, 'FMDD'))) AS THU,
         MIN (DECODE (TO_CHAR (DAYS, 'D'), 6, TO_CHAR (DAYS, 'FMDD'))) AS FRI,
         MIN (DECODE (TO_CHAR (DAYS, 'D'), 7, TO_CHAR (DAYS, 'FMDD'))) AS SAT
  FROM   ( SELECT BASE_MON + LEVEL - 1 AS DAYS,
                  ( TRUNC(BASE_MON + LEVEL - 1, 'D') - TRUNC(TRUNC(BASE_MON + LEVEL - 1, 'Y'), 'D') ) / 7 + 1 AS WEEK_GRP
           FROM   ( SELECT TO_DATE ('2009' || '10', 'YYYYMM') AS BASE_MON FROM DUAL )
           CONNECT BY BASE_MON + LEVEL - 1 <= LAST_DAY (BASE_MON) )
  GROUP BY WEEK_GRP
  ORDER BY WEEK_GRP