Group by week

Question

Hi,
I need to build a SQL Query that group data by week.
for example :
table looks like this
the_date the_qty
6/5/2002 1
6/10/2002 4
6/14/2002 5
6/15/2002 36
6/19/2002 76
6/20/2002 88
6/21/2002 88
6/22/2002 24
6/24/2002 53
6/25/2002 281
6/28/2002 2
6/30/2002 3
desired result
6/9/2002 1
6/16/2002 41
6/23/2002 276
6/30/2002 336
7/7/2002 3
thanks
regards
sunil

Answer 1

Hi,
use
group by next_day(trunc(date_column-1),'SUNDAY')
Best,
EAThis is not correct.
SELECT
     next_day(trunc(the_date-1),'SUNDAY')     the_date,
     SUM(the_qty)               the_qty
FROM
     t
GROUP BY
     next_day(trunc(the_date-1),'SUNDAY')
THE_DATE        THE_QTY
06/09/2002            1
06/16/2002           45
06/23/2002          276
06/30/2002          339
... or group by trunc(yourdate,'W')trunc(yourdate,'W') will not produce the desired result in this case.
SELECT
     TRUNC(the_date, 'W')     the_date,
     SUM(the_qty)          the_qty
FROM
     t
GROUP BY
     TRUNC(the_date, 'W')
THE_DATE        THE_QTY
06/01/2002            1
06/08/2002            9
06/15/2002          288
06/22/2002          360
06/29/2002            3