Re: Count rows group by time intervals

Howdy, Loredana.

You need a query that returns the number of receivers on each theme, in two days intervals, is this correct?

Please try something like this. I am not sure if it works, because I don't have a table like yours.
I am assuming your table is called table

SELECT a."date",a."theme",a.receiver,COUNT(*)
FROM table a
INNER JOIN table b
ON a."theme" = b."theme" AND a.receiver = b.receiver
WHERE (((b."date" - a."date") = 1) OR (b."date" - a."date") = 0)
GROUP BY a."date",a."theme",a.receiver
HAVING (a."date" - '2007-01-01' ) % 2 = 0
ORDER BY a."date"

Then tell me if it worked

Cheers,
Oliveiros

----- Original Message -----
From: Loredana Curugiu
To: pgsql-novice(at)postgresql(dot)org
Sent: Wednesday, May 09, 2007 1:07 PM
Subject: [NOVICE] Count rows group by time intervals

Dear all,

I have the following table:

theme | receiver | date
---------+----------------------+------------------------
LIA | +40741775622 | 2007-04-27 00:00:00+00
LIA | +40741775622 | 2007-04-27 00:00:00+00
LIA | +40741775622 | 2007-04-27 00:00:00+00
LIA | +40741775622 | 2007-04-27 00:00:00+00
LIA | +40741775622 | 2007-04-27 00:00:00+00
LIA | +40741775622 | 2007-04-27 00:00:00+00
LIA | +40741775622 | 2007-04-27 00:00:00+00
LIA | +40741775622 | 2007-04-27 00:00:00+00
LIA | +40741775622 | 2007-04-27 00:00:00+00
LIA | +40741775622 | 2007-04-26 00:00:00+00
LIA | +40741775622 | 2007-04-26 00:00:00+00
LIA | +40741775622 | 2007-04-26 00:00:00+00
LIA | +40741775622 | 2007-04-26 00:00:00+00
LIA | +40741775622 | 2007-04-26 00:00:00+00
LIA | +40741775622 | 2007-04-25 00:00:00+00
LIA | +40741775622 | 2007-04-25 00:00:00+00
LIA | +40741775622 | 2007-04-25 00:00:00+00
LIA | +40741775622 | 2007-04-25 00:00:00+00
LIA | +40741775622 | 2007-04-25 00:00:00+00
MIA | +40741775622 | 2007-04-27 00:00:00+00
MIA | +40741775622 | 2007-04-27 00:00:00+00
MIA | +40741775622 | 2007-04-27 00:00:00+00
MIA | +40741775622 | 2007-04-27 00:00:00+00
MIA | +40741775622 | 2007-04-27 00:00:00+00
MIA | +40741775622 | 2007-05-09 00:00:00+00

I would like to count rows group by theme, receiver, and time intervals of
two days. I don't know how to start.

Hope that somebody could help me.