Re: week ending

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);