Re: Relation subset operators

From: paul c <>
Date: Fri, 05 Jun 2009 20:12:16 GMT
Message-ID: <A_eWl.30766$PH1.1049_at_edtnps82> wrote:
> For the moment, let's keep aggregating out of the equation. First, I
> want to make sure I understand correctly Question 8. The debunk link
> provided does not explain under what conditions a salesman, who'd be a
> part of a set of salesmen who have sold ALL purple cars, would NOT
> also be a salesman who sold AT LEAST one purple car. I would
> appreciate if you could give me one example clarifying the previous
> question ?

Maybe this answer is easier for some of us: there are no purple people, yet we know there are purple people eaters: Received on Fri Jun 05 2009 - 22:12:16 CEST

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