On Mon, 11 Jun 2001, Mario Weilguni wrote:
> > relation; as a table, with a UNIQUE(father_id), UNIQUE(mother_id)
> > constraint (a person can be only married once).
>
> Is not true, at least not in some arabic countries.
in that case my model is even better since it *allows* for that case (by
removing the UNIQUE constraints), where the REFERENCES model has an issue.