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From: Jeremy Harris <jgh@wizmail.org>
To: pgsql-performance@postgresql.org
Subject: Re: Optimising a query
Date: Wed, 19 Dec 2007 17:12:08 +0000
Message-ID: <476950E8.50009@wizmail.org> (raw)
In-Reply-To: <4768B4D1.1090702@reynolds.com.au>
References: <4768B4D1.1090702@reynolds.com.au>

Paul Lambert wrote:
> "                                            ->  Merge Join 
> (cost=35.56..19732.91 rows=12 width=48) (actual time=0.841..2309.828 
> rows=206748 loops=1)"

I'm no expert, but in the interests of learning: why is the
rows estimate so far out for this join?

Thanks,
    Jeremy




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