Do yourself a favor; forget the relational calculus. Nobody even thinks
about it in the real world, and it only serves to confuse when learning.
Concentrate on learning SQL from a basic SQL book that deals with basic
realtional concepts as well.
"Adam Kingston" <akingston888_at_hotmail.com> wrote in message
news:a5db5v$fb8$1_at_slb6.atl.mindspring.net...
> I am self-studying with a relational DB book.
> Let's say:
> Table X has attribute A, B, C
> Table Y alsa has attribute A, B, C
> A,B,C are common attributes.
>
> The book teaches relational algebra and calculus but doesn't have much
> examples on Oracle's SQL.
>
> I would like to learn how to convert the following expression (for
example)
> into SQL with Oracle DBMS.
>
> projectA(projectB(projectC(X union Y)))
>
> Thanks.
>
>
Received on Mon Feb 25 2002 - 14:12:27 CST
