Quoth Bob Badour:
> Jon Heggland wrote:
>> Minor point: Is designation of primary keys really at the logical level?
>
> Yes.
>
>> Are there any substantial logical consequences?
>
> The preponderance of foreign key references will refer to the primary
> key when one designates a primary key.
Granted, but it will be explicit which key a foreign key refers to (or
it will be implicitly given by the attribute names in the foreign key).
Primary key designation is neither necessary nor sufficient for this.
--
Jon
Received on Thu Dec 06 2007 - 08:16:56 CST
