Re: Very simple question to relational theorists.
From: Evgeniy Grigoriev <grigoriev.e_at_gmail.com>
Date: Fri, 14 Sep 2012 00:34:44 -0700 (PDT)
Message-ID: <43164d36-1c2f-465b-a667-fa0e6bfb3f5b_at_googlegroups.com>
Date: Fri, 14 Sep 2012 00:34:44 -0700 (PDT)
Message-ID: <43164d36-1c2f-465b-a667-fa0e6bfb3f5b_at_googlegroups.com>
No I mean how the name Q links to the wff? Where a info exists that wff for Q is R(A,B,...) AND S(X,Y,...,A,...)? I think the wff is given by the fact that Q is R JOIN S (once again - I cannot imagine how it is possibly to operate on relations without operations on their predicates). But instead of "Q" i can use any string in any language or any value of any sign or anything else. There is no link between NAME of a virtual relation and WFF of the relation.
My questin is about how posiible names of virtual relation can be used. So my question is - why do you tell me about predicates? Received on Fri Sep 14 2012 - 09:34:44 CEST