On Fri, Aug 17, 2001 at 11:37:33AM +0100,
"Michael Ansley (UK)" <Michael.Ansley@intec-telecom-systems.com> wrote:
>
> Um, no, primary keys should not always be opaque. Technical primary
> keys should always be opaque. Relational modelling has been built to
I think it has more to do with efficiency and whether or not you ever
expect the primary key values to change, then how hard it is to read an
ER diagram.