Creating calendar

Question

Create calendar view for week, month, year according to inputs

Answer 1

Hi,
What is different about a monthly and a weekly calendar? Only the starting date and the number of days. You can change the query posted by using CASE expressions to get different starting dates and numbers of days.
WITH      days_of_curr_period      AS
     SELECT      CASE
              WHEN  :p_period = 'MONTH'
              THEN  TRUNC (SYSDATE, 'MONTH')
              ELSE  TRUNC (SYSDATE + 1, 'IW') - 1
          END + ROWNUM - 1      AS datum
     FROM    DUAL
     CONNECT BY ROWNUM <= CASE
                     WHEN  :p_period = 'MONTH'
                     THEN  TRUNC (ADD_MONTHS (SYSDATE, 1), 'MONTH')
                         - TRUNC (            SYSDATE    , 'MONTH')
                     ELSE  7
                    END
,     data_formatter           AS
     SELECT      TRUNC (datum + 1, 'IW')                         AS iweek,
          TO_CHAR (datum, 'DY', 'NLS_DATE_LANGUAGE=AMERICAN')      AS mydateday,
          TO_CHAR (datum, 'DD') AS mydate
     FROM      days_of_curr_month
SELECT       MAX (DECODE (mydateday, 'SUN', mydate))     AS sun
       MAX (DECODE (mydateday, 'MON', mydate))     AS mon,
       MAX (DECODE (mydateday, 'TUE', mydate))     AS tue,
       MAX (DECODE (mydateday, 'WED', mydate))     AS wed,
       MAX (DECODE (mydateday, 'THU', mydate))     AS thu,
       MAX (DECODE (mydateday, 'FRI', mydate))     AS fri,
       MAX (DECODE (mydateday, 'SAT', mydate))     AS sat
FROM        data_formatter
GROUP BY  iweek
ORDER BY  iweek
;Don't convert from one datatype to another (for example, from DATE to VARCHAR2) without a good reason.
Particularly in this problem. Don't you find it easier to GROUP- and ORDER BY a DATE?