From: Rajesh Kumar Mallah <mallah.rajesh@gmail.com>
To: A. Kretschmer <andreas.kretschmer@schollglas.com>
Cc: pgsql-sql@postgresql.org
Subject: Re: Random()
Date: Sat, 18 Nov 2006 23:02:33 +0530
Message-ID: <a97c77030611180932q26af1cd3h8fb33a0fe4e3dd89@mail.gmail.com> (raw)
In-Reply-To: <20061116191632.GA21285@a-kretschmer.de>
References: <55c095e90611161031h7a1ce42chd9a59a53ba7e7028@mail.gmail.com>
<20061116191632.GA21285@a-kretschmer.de>
On 11/17/06, A. Kretschmer <andreas.kretschmer@schollglas.com> wrote:
> am Thu, dem 16.11.2006, um 16:31:14 -0200 mailte Ezequias Rodrigues da
> Rocha folgendes:
> > Hi list,
> >
> > I have a bigint collumn and I would like to generate a random number
> within the
> > numbers of my column.
>
> select <bigint_column> from <your_table> order by random() limit 1;
This query will tend to get slower as the table grows because of the sorting.
it possible to get a row from a random offset
how about
select <bigint_column> from <your_table> limit 1 offset 20000*random() ;
?
regds
mallah.
>
>
> Andreas
> --
> Andreas Kretschmer
> Kontakt: Heynitz: 035242/47215, D1: 0160/7141639 (mehr: -> Header)
> GnuPG-ID: 0x3FFF606C, privat 0x7F4584DA http://wwwkeys.de.pgp.net
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To: pgsql-sql@postgresql.org
Cc: mallah.rajesh@gmail.com, andreas.kretschmer@schollglas.com
Subject: Re: Random()
In-Reply-To: <a97c77030611180932q26af1cd3h8fb33a0fe4e3dd89@mail.gmail.com>
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