Message-ID: <44AC8F6A.4090704@NarrowPathInc.com>
Date: Thu, 06 Jul 2006 00:19:54 -0400
From: Keith Worthington <KeithW@NarrowPathInc.com>
Reply-To: KeithW@NarrowPathInc.com
Organization: Narrow Path, Inc.
User-Agent: Mozilla Thunderbird 1.0.6 (Windows/20050716)
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To: pgsql-sql@postgresql.org
Subject: week ending
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Hi All,

I just finished writing a query that groups data based on the week number.

SELECT EXTRACT(week FROM col_a) AS week_number,
        sum(col_b) AS col_b_total
   FROM foo
  WHERE foobar
  GROUP BY EXTRACT(week FROM col_a)
  ORDER BY EXTRACT(week FROM col_a);

I would like to generate the starting date or ending date based on this 
number.  IOW instead of telling the user "week number" which they won't 
understand I would like to provide either Friday's date for "week 
ending" or Monday's date for "week beginning".

SELECT <something> AS week_ending,
        sum(col_b) AS col_b_total
   FROM foo
  WHERE foobar
  GROUP BY EXTRACT(week FROM col_a)
  ORDER BY EXTRACT(week FROM col_a);

-- 

Kind Regards,
Keith