Re: Functional Dependencies?
From: Jonathan Leffler <jleffler_at_earthlink.net>
Date: Sun, 02 Oct 2005 03:24:52 GMT
Message-ID: <8qI%e.6074$oc.362_at_newsread2.news.pas.earthlink.net>
Date: Sun, 02 Oct 2005 03:24:52 GMT
Message-ID: <8qI%e.6074$oc.362_at_newsread2.news.pas.earthlink.net>
paul c wrote:
> I presume this is the same as saying that the attribute set, {}, is a
> key.
> I wonder if the FD {X} -> {} means anything?
Not really; it is a trivial FD since the RHS is a subset of the LHS of the FD.
-- Jonathan Leffler #include <disclaimer.h> Email: jleffler_at_earthlink.net, jleffler_at_us.ibm.com Guardian of DBD::Informix v2005.02 -- http://dbi.perl.org/Received on Sun Oct 02 2005 - 05:24:52 CEST