Re: Noninferential vs. inferential DBMS
From: Paul <paul_at_test.com>
Date: Mon, 17 May 2004 16:44:37 +0100
Message-ID: <R55qc.4379$wI4.499382_at_wards.force9.net>
Date: Mon, 17 May 2004 16:44:37 +0100
Message-ID: <R55qc.4379$wI4.499382_at_wards.force9.net>
x wrote:
> Or is projecting the tuple
> ('Fred Smith', 123, 10, 10,000)
> onto
> ('Fred Smith', 123, 10)
> an example of inference?
>
> The answer is:
> This depends if the projection was done by the DBMS or by the application
> programmer/database user.
> If the DBMS had a rule that said (a, b, c , d, e) -->(a, b, c) and this rule
> was used, then projecting the tuple is an example of inference.
But by itself the tuple ('Fred Smith', 123, 10, 10000) is meaningless.
Paul. Received on Mon May 17 2004 - 17:44:37 CEST