Am Montag, 11. Juni 2001 10:25 schrieb Marc SCHAEFER:
> I would remove the father and mother references, and add a
> is_married
> 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 countr
On Sun, 10 Jun 2001 [EMAIL PROTECTED] wrote:
>
> > > I was just creating this little database for demonstrating the use of
> > > foreign keys constraints.
> > >
> > > I was about the create 3 tables, namely mother, father and child. Mother has
> > > a foreign key pointing at father ( id ), and
