Re: join selectivity

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: strk(at)refractions(dot)net
Cc: Mark Cave-Ayland <m(dot)cave-ayland(at)webbased(dot)co(dot)uk>, pgsql-hackers(at)postgresql(dot)org, postgis-devel(at)postgis(dot)refractions(dot)net
Subject: Re: join selectivity
Date: 2004-12-23 15:48:39
Message-ID: 28882.1103816919@sss.pgh.pa.us
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strk(at)refractions(dot)net writes:
> So it should NOT depend on full number of rows either, is this right ?

No, it's supposed to return a fraction.

regards, tom lane

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