Re: more on delete from join
Date: Thu, 27 Aug 2009 11:14:10 -0700 (PDT)
Message-ID: <21012873-8daa-481b-a0b1-0c0a95899e10_at_g31g2000yqc.googlegroups.com>
On Aug 26, 3:51 pm, Tegiri Nenashi <tegirinena..._at_gmail.com> wrote:
> On Aug 26, 1:03 pm, paul c <toledobythe..._at_oohay.ac> wrote:
(snip)
> Stop right there. You were writing R UNION A, so R and A are relations
> (or predicates) and not propositions. Once again, some propositions
> are predicates (namely 0-ary ones), but most of them aren't!
>
(snip)
In one of his dbdebunk papers (and probably in other writings), Date
gives the following definition:
"A proposition is a predicate in which all variables are bound; ...".
This doesn't to match with your statement above. What propositions are
not predicates? Is there another notion to the term that Date is
ignoring that you're using for this discussion?
Thanks,
TroyK
Received on Thu Aug 27 2009 - 20:14:10 CEST