Date: Thu, 26 Jan 2006 13:46:04 +0100
From: Andreas Kretschmer <akretschmer@spamfence.net>
To: pgsql-sql@postgresql.org
Subject: Re: question with times and intervals
Message-ID: <20060126124604.GA15790@KanotixBox>
References: <20060126115816.GA9924@webserv.wug-glas.de>
	<43D8BBE7.4050108@archonet.com>
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Richard Huxton <dev@archonet.com> schrieb:

> Now (upper_time - lower_time) is the interval you want and summing them 
> will give you your answer.
> 
> Any help?

Yes, thanks.

But, i remember a little function that i wrote in the past:
http://a-kretschmer.de/tools/time_intersect.sql

And now i have a solution (i hope):

test=# select id, status,
test-#         sum((time_intersect(t_start, t_end, '2006/01/21 00:00:00'::timestamptz, '2006/01/22 23:59:59'::timestamptz)).t2 -
test(#                 (time_intersect(t_start, t_end, '2006/01/21 00:00:00+1'::timestamptz, '2006/01/22 23:59:59+1'::timestamptz)).t1)
test-# from status_log
test-# where  (t_start, t_end) overlaps ('2006/01/21 00:00:00+1'::timestamptz, '2006/01/22 23:59:59'::timestamptz)
test-# group by id, status
test-# order by 1,2;
 id | status |   sum
----+--------+----------
  1 |      1 | 32:00:00
  1 |      2 | 15:59:59
(2 rows)


Okay, now i can write a function similar above which returns the
interval and the i can sum() this.


Thanks, Andreas
-- 
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