From: Stijn Vanroye <s.vanroye@farcourier.com>
To: pgsql-sql@postgresql.org
Subject: select distinct and order by
Date: Wed, 28 Apr 2004 11:27:06 +0200
Message-ID: <71E201BE5E881C46811BA160694C5FCB046730@fs1000.farcourier.com> (raw)
Hello everybody,
I have a short question:
I'm trying to run the following query:
select distinct on (staff_id) staff_id, fullname, loginname from staff
where staff_id in
(select staff_id from staffmembership where staffgroup_id=#SomeIdValue#)
order by fullname
I get the follwing error:
select distinct on expressions must match the initial order by expression
Does this mean that I can only order by the same fields as the ones that I use in the distinct?
If so, is there still a way that I can select distinct on the keyfield, and still sort by the name. However unlikely, it could happen that two people have the same name, so a distinct on fullname could make problems.
The facts:
- PostgreSQL 7.3.2 running on RH 9
- pgODBC 7.3.0200
- Borland Delphi 7 enterprise
Regards,
Stijn Vanroye
-=[Today I got more responsabilities from my boss, as from now I'm responsible for everything that goes wrong ...]=-
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: s.vanroye@farcourier.com
Subject: Re: select distinct and order by
In-Reply-To: <71E201BE5E881C46811BA160694C5FCB046730@fs1000.farcourier.com>
* 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