Re: Foreign superkey support

David Cressey wrote:
> "Marshall" <marshall.spight_at_gmail.com> wrote in message
> news:1155100237.103860.180160_at_h48g2000cwc.googlegroups.com...
>
> > In other words, there is a many-to-many relationship between
> > constraints and relvars. (Or relations, if we are thinking in
> > descriptive rather than prescriptive terms.) For example,
> > we often speak of a foreign key constraint as belonging to
> > one particular table, but it is equally a constraint on two tables.
> > On one table it restricts inserts and on another table it restricts
> > deletes. So we must necessarily classify it as a database
> > constraint. But really, all constraints are all database constraints,
> > although there may be some database constraints that only
> > happen to be quantified over a single relvar.
> >
>
> Here I am as Johnny one note, chiming in again.

Dude, any time. I'm not a recent college graduate who believes he already knows everything he needs to :-) The Wisdom of the Elders is welcome.

> And how did I come to know DSRI? DEC Rdb/VMS was DSRI compliant.
> You knew I was going to come around to that, didn't you???

I googled for Digital System Relational Interface and there wasn't much. Might you be able to find some on-line references?

Marshall Received on Wed Aug 09 2006 - 16:38:52 CEST