From: Stephan Szabo <sszabo@megazone.bigpanda.com>
To: Rick Schumeyer <rschumeyer@ieee.org>
Cc: pgsql-sql@postgresql.org
Subject: Re: pg, mysql comparison with "group by" clause
Date: Tue, 11 Oct 2005 14:32:45 -0700 (PDT)
Message-ID: <20051011142658.C54076@megazone.bigpanda.com> (raw)
In-Reply-To: <001001c5cea8$77cabc90$0300a8c0@dell8200>
References: <001001c5cea8$77cabc90$0300a8c0@dell8200>
On Tue, 11 Oct 2005, Rick Schumeyer wrote:
> I'm not sure what I was thinking, but I tried the following query in pg:
>
> SELECT * FROM t GROUP BY state;
>
> pg returns an error.
>
> Mysql, OTOH, returns the first row for each state. (The first row with
> "AK", the first row with "PA", etc.)
>
> I'm no SQL expert, but it seems to me that the pg behavior is correct, and
> the mysql result is just weird. Am I correct?
In your case, it sounds like the mysql result is wrong. I believe SQL99
would allow it if the other columns were functionally dependant upon state
(as there'd by definition only be one value for the other columns per
group).
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: sszabo@megazone.bigpanda.com, rschumeyer@ieee.org
Subject: Re: pg, mysql comparison with "group by" clause
In-Reply-To: <20051011142658.C54076@megazone.bigpanda.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