Re: Functional Dependency to constrain a relation to exactly one element?

Marshall wrote:

> If it can't be done with an FD, can we do it with a constraint?
> Trivially we can do it with an aggregate constraint:
>
> constraint(R.count() == 1)
>
> but I'm curious if such a thing can be done without reference
> to an aggregate function.

var R { ... } key { };

Regards
  Alfredo Received on Mon Oct 02 2006 - 06:41:32 CDT