Få første ugedag fra ugenummer

prøv dette:

select next_day(max(d), 'sun') requested_sun
  from (select to_date('01-01-2012', 'dd-mm-yyyy') + (rownum-1) d from dual connect by level <= 366)
 where to_char(d, 'ww') = 49-1;

Indstil blot dit år to_date('01-01-2012' og uge nummer-1 49-1 efter behov.

søndagen i den 49. uge af 2008?

SQL> select next_day(max(d), 'sun') requested_sun
  2    from (select to_date('01-01-2008', 'dd-mm-yyyy') + (rownum-1) d from dual connect by level <= 366)
  3   where to_char(d, 'ww') = 49-1;

REQUESTED
---------
07-DEC-08

og 2012

SQL> select next_day(max(d), 'sun') requested_sun
  2    from (select to_date('01-01-2012', 'dd-mm-yyyy') + (rownum-1) d from dual connect by level <= 366)
  3   where to_char(d, 'ww') = 49-1;

REQUESTED
---------
02-DEC-12