Next Non Holiday date

Question

I need to find the next non holiday date for a set of rows in table.I have a separate table where all holidays are listed.Please help me to find the next non holiday date using decode function.
Holiday Table sructure:
create table holiday(no number,holidaydate date);
insert into holiday values(1,to_date('17-AUG-2013','dd/mm/yyyy');
insert into holiday values(1,to_date('05-SEP-2013','dd/mm/yyyy');
I have a code which seems to be wrong.
select decode (lapsedate ,
                                           laps.holidaydate , DECODE
                                                 (lapsedate +1,
                                                  laps.holidaydate + 1, DECODE
                                                          (lapsedate + 2,
                                                             laps.holidaydate
                                                           + 2, lapsedate
                                                            + 3,
                                                           lapsedate + 2
                                                  lapsedate + 1
                                           lapsedate
                                          ) from dt;

Answer 1

Hi,
Here's one way to do that with your current tables:
WITH    cntr       AS
    SELECT  LEVEL   AS n
    FROM    dual
    CONNECT BY   LEVEL <= 4 -- longest possible distance to next work day
SELECT    m.ndate
,         m.ndate + MIN (c.n)   AS next_work_day
FROM             mycalendar  m
CROSS JOIN       cntr        c
LEFT OUTER JOIN  holiday     h   ON  h.holidaydate = m.ndate + c.n
WHERE     h.holidaydate  IS NULL
AND       TO_CHAR ( m.ndate + c.n
                  , 'Dy'
                  , 'NLS_DATE_LANGUAGE=ENGLISH'  -- If needed (but never hurts)
                  )    NOT IN ('Sat', 'Sun')
GROUP BY  m.ndate
ORDER BY  m.ndate
This assumes that the next work day (that is, non-holiday, Monday through Friday) will be within the next 4 days (which is true where I work).  You may need to change the magic number in cntr (4, above) depending on your holidays.
Instead of a holiday table with 1 row per holiday, consider having a calendar table, with 1 row per day, regardless of whether the day is a holiday, weekend or work day.  You can have a next_work_day column in the table (populated by a query similar to the one above).  It will be more efficient in the long run, and will make coding individual queries much simpler.