Re: ?? Functional Dependency Question ??

From: paul c <>
Date: Tue, 21 Oct 2008 15:54:51 GMT
Message-ID: <fXmLk.2921$fF3.1823_at_edtnps83>

David BL wrote:
> Consider that in the FD world symbol X represents a set of attributes
> from some relation R. Let some tuple of R be given. Then as a
> proposition we interpret X as implying that we are given or can deduce
> (for the given tuple) the values of all the attributes associated with
> X. This interpretation makes it obvious that unions of attributes
> map to logical conjunctions, and that an FD maps to a logical
> implication.

Thanks, but how does that interpretation work when R has no attributes? Received on Tue Oct 21 2008 - 17:54:51 CEST

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