Re: Nested Sets And Pedigrees

"Nis Jorgensen" <nis_at_dkik.dk> wrote in message news:pm3ebu4qibfo2k7t1o9nd448veledhfsed_at_4ax.com...
> On Wed, 10 Apr 2002 10:13:04 +0200, "Jan Hidders"
> <hidders_at_uia.ua.ac.be> wrote:
> >
> >Was my proposal really that unclear? There is no problem if you realize
that
> >there are actually two hierarchies involved. One hierarchy is defined by
the
> >father-of relationship and the other hierarchy is defined by the
mother-of
> >relationship. Both relationships define true hierarchies and can be
> >represented with the nested-sets approach.
>
> Well, you can store the information in that way, but there is no real
> benefit gained from it. The nice thing about the nested set model (and
> the equivalent materialized path model) is tha you can easily find all
> ancestors/descendants of a given node. This is not possible in your
> model.

Ah, finally somebody who is wearing his thinking cap. :-) Indeed, unless you have some typical questions concerning mitochondrial DNA, the Y chromosome or last names, it is not going to help you very much.

• Jan Hidders