Re: Is relational theory irrelevant? (was Re: Dreaming About Redesigning SQL)

From: Mikito Harakiri <mikharakiri_at_iahu.com>
Date: Tue, 11 Nov 2003 10:45:34 -0800
Message-ID: <Ogasb.22$Up4.126@news.oracle.com>

"Bob Badour" <bbadour_at_golden.net> wrote in message news:xaadncLRvLrBjCyiRVn-gw_at_golden.net...
> Relations have no order. The ordered operand implies some conversion to a
> different type that is ordered, which then changes the logical model from
a
> "relational model" to a "relational and something else model".

...changes the model from a "relational model" to a "mathematical model". Some think separating logic from the rest of the math is a good idea, while some don't.

> Sorting is physical when dealing with an unordered logical structure and
may
> not even be required.

Ordering is legitimate mathematical construct. It is a question, though, if one can have a simple algebra/calculus that would include ordering too. Received on Tue Nov 11 2003 - 12:45:34 CST