Re: Logical equivalence of simple and complex types under the relational model?
From: Paul <paul_at_test.com>
Date: Wed, 01 Dec 2004 22:31:00 +0000
Message-ID: <41ae4624$0$52989$ed2619ec_at_ptn-nntp-reader03.plus.net>
>
> The "relational system" can not exist without the type system, so
> they are not independent.
Date: Wed, 01 Dec 2004 22:31:00 +0000
Message-ID: <41ae4624$0$52989$ed2619ec_at_ptn-nntp-reader03.plus.net>
Alfredo Novoa wrote:
>> The way I see it, DBMSs consist of two (orthogonal) components: a >> type system and a relational system.
>
> The "relational system" can not exist without the type system, so
> they are not independent.
Can it definitely not? Couldn't you have a basic relational system with just one type, with one operation (equality) being handled by the relational system?
This would be a kind of pathological relational system, which can optionally be extended in usefulness by the addition of a type system.
Paul. Received on Wed Dec 01 2004 - 23:31:00 CET