Wants get the week dates

Question

Hi guys,
I wants to get the weeks when i give the nth week number.
Eg:
SQL>  select to_date(to_char(sysdate,'iw'),'DD'),to_date(to_char(sysdate,'iw')+6,'DD')from dual
  2  where to_char(sysdate,'iw') =21
  3  ;
TO_DATE(T TO_DATE(T
21-MAY-12 27-MAY-12But when i give 1 or 2 inplace of 21st i am not getting the results.
Ok can i get without restricting my sysdate... ?
Thans
Edited by: san on May 24, 2012 5:04 PM

Answer 1

You could create a view containing all weeks and start/enddates for the current year using a CONNECT BY query and
select from that.
Example:
-- create a view containing all weeks for the current year
create or replace view week_generator as
select to_char(trunc(sysdate, 'yyyy')+level-1, 'iw') iweek
,      to_char(trunc(sysdate, 'yyyy')+level-1, 'dd-mm-yyyy') startdate
,      to_char(trunc(sysdate, 'yyyy')+level-1+6, 'dd-mm-yyyy') enddate
from   dual
connect by level <= last_day(add_months(trunc(sysdate, 'yyyy'), 11)) - trunc(sysdate, 'yyyy');
-- query the view:
select startdate
,      enddate
from   week_generator
where  iweek = 1;
select startdate
,      enddate
from   week_generator
where  iweek = 21;Depending on your exact requirement, you may need to do some adjustments:
SQL> select startdate
  2  ,      enddate
  3  from   week_generator
  4  where  iweek = 1;
STARTDATE  ENDDATE
02-01-2012 08-01-2012
03-01-2012 09-01-2012
04-01-2012 10-01-2012
05-01-2012 11-01-2012
06-01-2012 12-01-2012
07-01-2012 13-01-2012
08-01-2012 14-01-2012
7 rows selected.
SQL> select startdate
  2  ,      enddate
  3  from   week_generator
  4  where  iweek = 21;
STARTDATE  ENDDATE
21-05-2012 27-05-2012
22-05-2012 28-05-2012
23-05-2012 29-05-2012
24-05-2012 30-05-2012
25-05-2012 31-05-2012
26-05-2012 01-06-2012
27-05-2012 02-06-2012
7 rows selected.