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

From: Marshall Spight <mspight_at_dnai.com>
Date: Wed, 12 Nov 2003 16:31:50 GMT
Message-ID: <Vftsb.179962$HS4.1498393@attbi_s01> 





"Bob Badour" <bbadour_at_golden.net> wrote in message news:VaWdndbrNqgr0y-iRVn-jg_at_golden.net...

>




> Relations have no order. The values in relations have order. An ordered

> structure, like an array for instance, involves physical order.




Why? Why can't you have logical order?



In fact, this is closer to what I understand of order in the
math textbooks I read. An ordered relation is a pair:



(relation, ordering function)



How is that physical?



In fact, the same relation can participate in many orderings.




Marshall
Received on Wed Nov 12 2003 - 10:31:50 CST












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