Re: Thinking about MINUS
From: paul c <toledobythesea_at_oohay.ac>
Date: Mon, 08 Jan 2007 11:32:25 GMT
Message-ID: <dZpoh.590897$R63.114568_at_pd7urf1no>
Date: Mon, 08 Jan 2007 11:32:25 GMT
Message-ID: <dZpoh.590897$R63.114568_at_pd7urf1no>
Marshall wrote:
...
> Ah, but when we are joining, which is to say unifying, two relations,
> and the two relations each make different, *incompatible* claims
> about the type associated with a particular attribute name, then
> I would say that well meets the criteria for being "contradictory."
> ...
Well, if I have 10 Navel Oranges and 10 Tangerine Oranges and I ask how
many Florida Oranges I've got, I would hope the answer would be zero,
not "contradiction".
p