Re: <OR> predicate?

From: paul c <toledobythesea_at_oohay.ac>
Date: Mon, 27 Sep 2010 18:28:09 GMT
Message-ID: <Zm5oo.1244$89.474_at_edtnps83>


On 27/09/2010 10:57 AM, paul c wrote:
...
> (I'm asking this question even though I personally have some difficulty
> reconciling parts of the A-algebra formal definitions, eg., on one hand,
> the heading of R <OR> TABLE_DEE must include the heading of TABLE_DEE
> which is the empty set...

Oops, I can see one mistake already, the heading being a set union, can't include the empty set. Received on Mon Sep 27 2010 - 20:28:09 CEST

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