From: Andreas Kretschmer <akretschmer@despammed.com>
To: pgsql-sql@postgresql.org
Subject: Re: [despammed] question about index
Date: Thu, 16 Dec 2004 12:01:39 +0100
Message-ID: <20041216110139.GA5899@Pinguin.wug-glas.de> (raw)
In-Reply-To: <20041216104154.GA30578@mail.librelogiciel.com>
References: <20041216104154.GA30578@mail.librelogiciel.com>
am 16.12.2004, um 11:41:54 +0100 mailte Jerome Alet folgendes:
> Hi,
>
> For a future databas, I plan to have got a table with a text field
> which can contain only three different values, say "VALUE1",
> "VALUE2", and "VALUE3"
Why text-fields for this task? I would prefer a smallint for this with a
check-contraint to check the values.
> be as fast as possible.
>
> considering that almost 70% of the rows will be with 'VALUE1', 20%
> will be with 'VALUE2' and 10% will be with 'VALUE3' on the average.
>
> should I create an index to speedup the counts or not ?
Yes.
Andreas
--
Andreas Kretschmer (Kontakt: siehe Header)
Tel. NL Heynitz: 035242/47212
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To: pgsql-sql@postgresql.org
Cc: akretschmer@despammed.com
Subject: Re: [despammed] question about index
In-Reply-To: <20041216110139.GA5899@Pinguin.wug-glas.de>
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