On Wed, Sep 23, 2009 at 8:13 AM, AnthonyV <avequeau@xxxxxxxxx> wrote: > Hello, > > I have a table like : > > date | value > ------------------------------- > 2009-09-19 | 1 > 2009-09-20 | 2 > 2009-09-21 | 6 > 2009-09-22 | 9 > 2009-09-23 | 1 > > I'd like a request which gives me the sum of each last n days. > For example, if I want the sum of each 3 days, I want this result: > > date | sum_value > ------------------------------- > 2009-09-19 | 1 (sum from 2009-09-17 to 2009-09-19) > 2009-09-20 | 3 (sum from 2009-09-18 to 2009-09-20) > 2009-09-21 | 9 (sum from 2009-09-19 to 2009-09-21) > 2009-09-22 | 17 (sum from 2009-09-20 to 2009-09-22) > 2009-09-23 | 16 (sum from 2009-09-21 to 2009-09-23) > > I try to make a subquery which is apply on each row of a query, but it > does work. select date, (select count(*) from foo where date between f.date - 1 and f.date + 1) from foo f; -- Sent via pgsql-general mailing list (pgsql-general@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general
