From: | Frank Bax <fbax(at)sympatico(dot)ca> |
---|---|
To: | pgsql-sql(at)postgresql(dot)org |
Subject: | Re: Help with simple query |
Date: | 2005-12-29 00:41:32 |
Message-ID: | 5.2.1.1.0.20051228193054.00a3e0a0@pop6.sympatico.ca |
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Thread: | |
Lists: | pgsql-sql |
At 06:58 PM 12/28/05, Collin Peters wrote:
>The following query will return me all the latest dates, but I can't
>return the note_id or subject with it.
>SELECT n.user_id, max(n.modified_date)
>FROM notes n
>GROUP by n.user_id
>ORDER BY n.user_id
>
>Is this simpler than I am making it?
No, it's not "simple". You need to join the results of above sql back to
the original table (and relocate the order by clause):
SELECT notes.note_id, notes.user_id, maxx.max_date, notes.note
FROM
(SELECT n.user_id, max(n.modified_date) AS max_date FROM notes n GROUP by
n.user_id)
AS maxx
JOIN notes on notes.user_id = maxx.user_id AND notes.modified_date =
maxx.max_date
ORDER BY notes.user_id;
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