[펌] 달력 SQL

-- Calendar SQL for Oracle
-- by NalCoder / valenny.tistory.com / valenny@naver.com
-- on 2009.7.30

SELECT *
  FROM (    SELECT MIN ( CASE WHEN TO_CHAR (dt + LEVEL - 1, 'd') = '1' THEN LEVEL
                              ELSE NULL END ) AS sun
                  ,MIN ( CASE WHEN TO_CHAR (dt + LEVEL - 1, 'd') = '2' THEN LEVEL
                              ELSE NULL END ) AS mon
                  ,MIN ( CASE WHEN TO_CHAR (dt + LEVEL - 1, 'd') = '3' THEN LEVEL
                              ELSE NULL END ) AS tue
                  ,MIN ( CASE WHEN TO_CHAR (dt + LEVEL - 1, 'd') = '4' THEN LEVEL
                              ELSE NULL END ) AS wed
                  ,MIN ( CASE WHEN TO_CHAR (dt + LEVEL - 1, 'd') = '5' THEN LEVEL
                              ELSE NULL END ) AS thu
                  ,MIN ( CASE WHEN TO_CHAR (dt + LEVEL - 1, 'd') = '6' THEN LEVEL
                              ELSE NULL END ) AS fri
                  ,MIN ( CASE WHEN TO_CHAR (dt + LEVEL - 1, 'd') = '7' THEN LEVEL
                              ELSE NULL END ) AS sat
              FROM (   SELECT TO_DATE(:yyyymm,'YYYYMM') AS dt
                         FROM dual) t_dt
           CONNECT BY LEVEL <= LAST_DAY (dt) - dt + 1
             GROUP BY TRUNC (dt + LEVEL , 'iw')
             ORDER BY sat ); 

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