From: Christoph Haller <ch@rodos.fzk.de>
To: s.vanroye@farcourier.com
Cc: pgsql-sql@postgresql.org
Subject: Re: a wierd query
Date: Wed, 19 May 2004 10:55:22 METDST
Message-ID: <200405190855.KAA02721@rodos> (raw)
In-Reply-To: <71E201BE5E881C46811BA160694C5FCB046739@fs1000.farcourier.com>
>
> select distinct on (date, employee_id) employee_id, date from
> (
> select distinct on (begindate, employee_id) begindate as date, employ=
> ee_id from workhour
> UNION
> select distinct on (enddate, employee_id) enddate as date, employee_i=
> d from workhour
> )as dist
>
>
Just as a side note
If you don't use ORDER BY when using DISTINCT ON
you'll have unpredictable results.
Regards, Christoph
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Reply to all the recipients using the --to and --cc options:
reply via email
To: pgsql-sql@postgresql.org
Cc: ch@rodos.fzk.de, s.vanroye@farcourier.com
Subject: Re: a wierd query
In-Reply-To: <200405190855.KAA02721@rodos>
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
This inbox is served by DDX for PostgreSQL; see mirroring instructions
for how to clone and mirror all data and code used for this inbox