Find date if year, month, week and day is given

Question

Hi,
How to find the date, if year, month, week and day is given?
For example:
Given, year - 2010, month - 03, Day - Wednesday, Week - 3,
Then how can we get the date as 17-Mar-2010.
Thanks,
Chris

Answer 1

with dt_tbl as (
                select  2010 year,
                        3 month,
                        3 week,
                        'Wednesday' day
                  from  dual
select  trunc(to_date(year || '-' || month || '-01','yyyy-mm-dd'),'iw') + (week - 1) * 7 +
          case day
            when 'Monday' then 0
            when 'Tuesday' then 1
            when 'Wednesday' then 2
            when 'Thursady' then 3
            when 'Friday' then 4
            when 'Saturday' then 5
            when 'Sunday' then 6
          end dt
  from  dt_tbl
DT
17-MAR-10
SQL> SY.