Getting last-day-of-week dates within certain date range

Question

Hi all,
I have the following Challenge:
I want to know the dates of the last day of all the weeks within a certain range of dates.
For instance if my range would be 01-jun-2002 - 31-jun-2002
then the returned days should be (lastday of the week is sunday):
. 02-jun-2002
. 09-jun-2002
. 16-jun-2002
. 23-jun-2002
. 30-jun-2002
I want to accomplish this by only using sql (no pl/sql) in a ora 8.0.x rdbms
How would I do this? (if it's possible)
Tia,
Martin

Answer 1

Christian's solution returns
01-JUN-02
08-JUN-02
15-JUN-02
22-JUN-02
on my system. The first day of the week is dependent on NLS settings.
SELECT MAX(realdate)
FROM (
SELECT TO_CHAR(TO_DATE('31-may-2002','dd-mon-yyyy') + ROWNUM,'IW') weekno,
       TO_DATE('31-may-2002','dd-mon-yyyy') + ROWNUM realdate
FROM all_objects
WHERE rownum <= TO_DATE('30-Jun-2002','dd-mon-yyyy') - TO_DATE('01-Jun-2002','dd-mon-yyyy')
GROUP BY weeknoThe IW format model give ISO standard week numbers and a week always starts on Monday.