Re: Codd provided appropriate mathematics ... (was Re: Relational and MV (response to "foundations of relational theory"))
From: Tom Hester <$$tom_at_metadata.com>
Date: Fri, 27 Feb 2004 15:24:53 -0800
Message-ID: <4d175$403fd1c6$45033832$1192_at_msgid.meganewsservers.com>
Date: Fri, 27 Feb 2004 15:24:53 -0800
Message-ID: <4d175$403fd1c6$45033832$1192_at_msgid.meganewsservers.com>
There are relations in mathematics. These
just are not the relations of a relational data language. These are the
relations of a relational calculus or a relational algebra, both kinds of
logic.
"Mikito Harakiri" <mikharakiri_at_iahu.com> wrote in message
news:WwP%b.24$zB2.129_at_news.oracle.com...
Received on Sat Feb 28 2004 - 00:24:53 CETHere is unorthodox view. I queried Mathworld for "Relation" and fidn't find any. Hence the conclusion: "There is no Relation in math!""Tom Hester" <$$tom_at_metadata.com> wrote in message news:308d6$403fbc8a$45033832$31596_at_msgid.meganewsservers.com...No, the relational model is based on the notion of relation in symbolic logic. The interpretation of a relation may be required to be 1st order function free, resulting in a 1NF model; but there is no requirement that relations be 1NF for a database to be relational; and there has been a great deal of relational database theory developed around non-1NF (that is non first order function free) models. I simply gave a single reference to a single article. There are many books...This is supposed to be a theoretical news list but it seems to me that the relational bigots are incredibly ignorant of relational theory.