From: Bruno Wolff III <bruno@wolff.to>
To: Sjors <jkwast@freeler.nl>
Cc: pgsql-sql@postgresql.org
Subject: Re: howto?
Date: Mon, 17 Mar 2003 11:53:33 -0600
Message-ID: <20030317175333.GA21282@wolff.to> (raw)
In-Reply-To: <008901c2eca7$fa181110$04a779d9@cc299057a>
References: <008901c2eca7$fa181110$04a779d9@cc299057a>
On Mon, Mar 17, 2003 at 18:09:31 +0100,
Sjors <jkwast@freeler.nl> wrote:
> Hi,
>
> Being not able to grasp in full sql, I've decided to call on the list. I've got a table with points, place_id and distance between points and place_id. For each point there can be more place_id's but I want to selesct the one with the minimum distance. Now I can group by the points and select the min(distance) but I can't do this if place_id is involved. I used a statment like this:
>
> Select points, place_id, distance from table
> group by points, place_id, distance
> having count(*)>1 and distance=(select min(distance) from table
How about:
select distinct on (points) points, place_id, distance from table
order by points, distance;
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To: pgsql-sql@postgresql.org
Cc: bruno@wolff.to, jkwast@freeler.nl
Subject: Re: howto?
In-Reply-To: <20030317175333.GA21282@wolff.to>
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