Re: Towards a definition of atomic

From: Bob Badour <>
Date: Fri, 01 Feb 2008 15:02:03 -0400
Message-ID: <47a36cad$0$4068$>

Marshall wrote:

> On Feb 1, 8:15 am, Bob Badour <> wrote:

>>The important thing in this discussion is: The relational model treats
>>domain values as neither composable nor decomposable. They are
>>simply values upon which one may evaluate defined operations.

> If one goes just a bit further, one might say the only such operator
> is equality, which is clearly necessary for natural join, etc. A theta
> join, for example, is a join of two operand relations and a further
> join with the < relation.

Yes, the RM only requires one operation, and one can phrase all other simple operations as relations of some degree. What about aggregates? Received on Fri Feb 01 2008 - 20:02:03 CET

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