From: Greg Stark <gsstark@mit.edu>
To: Aaron Bono <postgresql@aranya.com>
Cc: Joe <dev@freedomcircle.net>
Cc: pgsql-sql@postgresql.org
Subject: Re: Repetitive code
Date: 16 Jun 2006 11:57:13 -0400
Message-ID: <87lkrx6qli.fsf@stark.xeocode.com> (raw)
In-Reply-To: <bf05e51c0606160744m5f28243cjf0fd6da11f48404d@mail.gmail.com>
References: <44920AA7.7070709@freedomcircle.net>
<bf05e51c0606151926n18555a65x28a0156f8bd217cc@mail.gmail.com>
<4492B248.7040406@freedomcircle.net>
<bf05e51c0606160744m5f28243cjf0fd6da11f48404d@mail.gmail.com>
"Aaron Bono" <postgresql@aranya.com> writes:
> I haven't stared at your query as long as you have so I may have missed
> something
Likewise I'm perhaps speaking too quickly, but at the risk of making a fool of
myself: you should perhaps realize that UNION has to do a fair amount of work
to eliminate duplicates. If you know the rows are going to be distinct or if
you don't care about duplicates you can save a lot of time by using UNION ALL
instead.
--
greg
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To: pgsql-sql@postgresql.org
Cc: gsstark@mit.edu, postgresql@aranya.com, dev@freedomcircle.net
Subject: Re: Repetitive code
In-Reply-To: <87lkrx6qli.fsf@stark.xeocode.com>
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