Re: Date and McGoveran comments on view updating 'problem'
From: paul c <toledobythesea_at_oohay.ac>
Date: Mon, 08 Dec 2008 19:27:27 GMT
Message-ID: <zye%k.3358$yK5.2196_at_edtnps82>
Date: Mon, 08 Dec 2008 19:27:27 GMT
Message-ID: <zye%k.3358$yK5.2196_at_edtnps82>
paul c wrote:
...
> where SSP' stands for the result and D stands for the relation, whatever
> it is, that we can deduce from the WHERE clause and MINUS is equivalent
> to <AND> in the formal definitions that Date and Darwen use in TTM
> (making this MINUS not so restrictive as their definition of MINUS).
> ...
Oops, should have said equivalent to <AND> (<NOT> ...). Also, by "not so restrictive, I mean that the 'headings' of the operands could be different. Received on Mon Dec 08 2008 - 20:27:27 CET