Re: Does Codd's view of a relational database differ from that ofDate&Darwin?[M.Gittens]

From: Jon Heggland <>
Date: Fri, 8 Jul 2005 11:15:29 +0200
Message-ID: <>

In article <>, says...
> User defined types

Whether they are user defined or not does not really matter.

> present rather archaic approach to units. Modern
> approach is symbolic manipulation

I'm not able to make sense of this. What are the domains of your relations? What does null mean? Is "<distance = 20 meters, time = 3 hours>" really a predicate? How does the system solve your 34477.985 = x*lb equation? In what way is this simpler or better than possreps?

Received on Fri Jul 08 2005 - 11:15:29 CEST

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