Re: insert to projection
From: paul c <toledobythesea_at_oohay.ac>
Date: Sun, 06 Sep 2009 18:40:18 GMT
Message-ID: <mmTom.44003$PH1.37678_at_edtnps82>
>
> Are you suggesting projection being updatable in respect to deletion?
Date: Sun, 06 Sep 2009 18:40:18 GMT
Message-ID: <mmTom.44003$PH1.37678_at_edtnps82>
Vadim Tropashko wrote:
> On Sep 4, 9:58 am, paul c <toledobythe..._at_oohay.ac> wrote:
>> ... We can delete from projection ...
>
> Are you suggesting projection being updatable in respect to deletion?
Not as things stand, at least not always, meaning not always with the conventional tables and relvars that have one predicate.
> I fail to see this, here is my worksheet:
> ...
If I read that worksheet right, it means we can't delete <p 1, q 'a'> from a conventional table or relvar and expect <p 1> to be negated, which I don't argue with. (whereas I don't think anybody disagrees that we already can delete <p 1> and expect <p 1, q 'a'> to be negated.) Received on Sun Sep 06 2009 - 20:40:18 CEST