Re: ER diagram question
From: Jonck van der Kogel <jonck_at_vanderkogel.net>
Date: 20 Jan 2004 13:28:47 -0800
Message-ID: <28a69e7c.0401201328.2220b0f1_at_posting.google.com>
Date: 20 Jan 2004 13:28:47 -0800
Message-ID: <28a69e7c.0401201328.2220b0f1_at_posting.google.com>
> It's only a better style if it's correct. Now look at a Project Communication
> and a Customer Communication to see if there are any differences in attributes.
> One possible solution is to create a super/sub type entity on the Communication
> entity. One subtype called Customer Communication would have a relationship
> to Customer, and the other subtype, Project Communication would have a relationship
> to Project.