From: Alvaro Herrera <alvherre@commandprompt.com>
To: Miroslav ?ulc <miroslav.sulc@startnet.cz>
Cc: pgsql-sql@postgresql.org
Subject: Re: SELECT DISTINCT too slow
Date: Thu, 1 Jun 2006 10:53:28 -0400
Message-ID: <20060601145327.GA19388@surnet.cl> (raw)
In-Reply-To: <447EFE92.2070509@startnet.cz>
References: <447EEAF1.7040305@startnet.cz>
<20060601135310.GB18513@surnet.cl>
<447EFE92.2070509@startnet.cz>
Miroslav ?ulc wrote:
> Well, "key" is not primary key from another table. It is just a column
> in pair "key" => "value".
> The structure of the table is this:
>
> Id (primary key)
> MRTPContactId (id of contact from table MRTPContact)
> Key (key from pair key => value)
> Value (value from pair key => value)
>
> So I want the get the list of keys used in the table.
The plan you get is the most efficient possible for that query. If you
had a table of possible keys (which should of course be FK of "Key"),
you could get a much faster version :-)
--
Alvaro Herrera http://www.CommandPrompt.com/
The PostgreSQL Company - Command Prompt, Inc.
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: alvherre@commandprompt.com, miroslav.sulc@startnet.cz
Subject: Re: SELECT DISTINCT too slow
In-Reply-To: <20060601145327.GA19388@surnet.cl>
* 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