Re: More on lists and sets
Date: Thu, 23 Mar 2006 16:37:43 +0100
Message-ID: <dvufg0$p8v$1_at_orkan.itea.ntnu.no>
David Cressey wrote:
> In this case, I'm interested in storing the data in relational tables
> (because of the power described by Codd Date & Darwen, etc), but I think a
> programmer is legitimately interested in viewing the data as if it were a
> hierarchy. (I'm treating HDM and MVDM as equivalent for purposes of this
> illustration).
>
> So I'm interested in a sublanguage that can SELECT the data using relational
> operators to join data from at least 3 tables, but can DELIVER the data to
> the program in NFNF (see Dawn's blog). That transfom is, as you pointed
> out, trivial from an information perspective.
> But it's not very easy from a programming perspective. And programmers
> would be more productive if it were easy.
It is *very* easy in Dataphor. Just put "embedded" tags on the two foreign key definitions.
-- JonReceived on Thu Mar 23 2006 - 16:37:43 CET