Re: union all vs. left outer join
From: David Cressey <david.cressey_at_earthlink.net>
Date: Wed, 16 Nov 2005 09:08:11 GMT
Message-ID: <%FCef.821$wf.131_at_newsread3.news.atl.earthlink.net>
Date: Wed, 16 Nov 2005 09:08:11 GMT
Message-ID: <%FCef.821$wf.131_at_newsread3.news.atl.earthlink.net>
<henrik.sorensen_at_balcab.ch> wrote in message news:dkqvf8$pmk$2_at_news.hispeed.ch...
> After all it doesn't make sense to scan the whole table, when not
necessary.
>
> I have verified this on a large production sized database with the real
> data, and the full scan of A-B-C cannot be right.
>
>
Does it still do the scan on a production sized database?