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help / color / mirror / Atom feedFrom: Gary Stainburn <gary.stainburn@ringways.co.uk>
To: pgsql-sql@postgresql.org
Subject: Re: value from max row in group by
Date: Thu, 25 Jul 2013 18:57:10 +0100
Message-ID: <201307251857.10326.gary.stainburn@ringways.co.uk> (raw)
In-Reply-To: <201307251845.51079.gary.stainburn@ringways.co.uk>
References: <201307251845.51079.gary.stainburn@ringways.co.uk>
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As usual, once I've asked the question, I find the answer myself.
However, it *feels* like there should be a more efficient way. Can anyone
comment or suggest a better method?
timetable=> select stts_id, stts_offset+stts_duration as total_duration
timetable-> from standard_trip_sections
timetable-> where (stts_id, stts_offset) in
timetable-> (select stts_id, max(stts_offset) from standard_trip_sections
group by stts_id);
stts_id | total_duration
---------+----------------
1 | 01:35:00
2 | 01:35:00
3 | 01:08:00
4 | 01:38:00
5 | 01:03:00
6 | 01:06:00
(6 rows)
timetable=>
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To: pgsql-sql@postgresql.org
Cc: gary.stainburn@ringways.co.uk
Subject: Re: value from max row in group by
In-Reply-To: <201307251857.10326.gary.stainburn@ringways.co.uk>
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