Re: Logical equivalence of simple and complex types under the relational model?

From: Paul <>
Date: Wed, 01 Dec 2004 22:58:41 +0000
Message-ID: <41ae4ca1$0$29738$>

>>>I am not sure that the split between complex and simple is well defined
>>It is not well defined at all.

I see it as almost a trivial definition.

> Which makes it difficult for me to understand Codd' s statement
> "A domain is simple if all its components are atomic (nondecomposable by the
> database system."
> and the requirement that all domains be simple,
> When this requirement does not seem amount to anything even within one
> model.

I think what he means is that the components are nondecomposable by relational operators as opposed to type operators.

Paul. Received on Wed Dec 01 2004 - 23:58:41 CET

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