Re: Codd provided appropriate mathematics ... (was Re: Relational and MV (response to "foundations of relational theory"))
From: Marshall Spight <mspight_at_dnai.com>
Date: Fri, 27 Feb 2004 03:01:09 GMT
Message-ID: <Vpy%b.404713$I06.4394730_at_attbi_s01>
Date: Fri, 27 Feb 2004 03:01:09 GMT
Message-ID: <Vpy%b.404713$I06.4394730_at_attbi_s01>
"Tom Hester" <$$tom_at_metadata.com> wrote in message news:aff87$403e41e1$45033832$6812_at_msgid.meganewsservers.com...
> Both are non-1NF. Codd defines first normal form in terms of simple
> domains. That is the interpretation of a single element in a domain can
> only be an atomic element of a set. It cannot be further decomposed.
That definition is not enough to exclude lists. Consider the set L of all lists; an element l in L is an atomic element of L.
Marshall Received on Fri Feb 27 2004 - 04:01:09 CET