Re: Weak Entity
From: Jan.Hidders <hidders_at_hcoss.uia.ac.be>
Date: 14 Oct 2002 11:21:32 +0200
Message-ID: <3daa8c9c$1_at_news.uia.ac.be>
Date: 14 Oct 2002 11:21:32 +0200
Message-ID: <3daa8c9c$1_at_news.uia.ac.be>
In article <u7nq9.1683$US2.17992_at_vixen.cso.uiuc.edu>,
Ashutosh Galande <galande_at_uiuc.edu> wrote:
>I think the reason why theres an emphasis on having a 1-N relationship with
>another strong entity is so that you can treat that relationship as a
>supporting relationship and the strong entity can lend its keys to form keys
>of the weak entity relation.
Sure. But that is an implementation issue and should not play a role in your conceptual schema. And how else would you model the non-empty set example?
- Jan Hidders