From: Tom Lane <tgl@sss.pgh.pa.us>
To: Bruce Momjian <pgman@candle.pha.pa.us>
Cc: Jelle Ouwerkerk <jelle@openface.ca>
Cc: pgsql-sql@postgresql.org
Subject: Re: random
Date: Mon, 05 Mar 2001 16:23:37 -0500
Message-ID: <20854.983827417@sss.pgh.pa.us> (raw)
In-Reply-To: <200103052104.QAA01988@candle.pha.pa.us>
References: <200103052104.QAA01988@candle.pha.pa.us>
Bruce Momjian <pgman@candle.pha.pa.us> writes:
>> Jelle Ouwerkerk <jelle@openface.ca> writes:
> Also, is there a way to randomize the order of a result set?
>>
>> There's always
>> SELECT * FROM foo ORDER BY random();
> However:
> test=> select * from pg_class order by random();
> does return some output. Is it random, and if so, how?
Sure. The function is marked noncachable, so it gets evaluated
afresh at each row --- but only once per row, as the sort step doesn't
recompute any values. Should work just peachy, and it seems to do
so in a couple quick tests.
regards, tom lane
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To: pgsql-sql@postgresql.org
Cc: tgl@sss.pgh.pa.us, pgman@candle.pha.pa.us, jelle@openface.ca
Subject: Re: random
In-Reply-To: <20854.983827417@sss.pgh.pa.us>
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