Foreign Keys Either/Or Design

[bennett]

Hi All

I am just working on a database I need a little help with the logic, I have 3 tables for example

Department
Staff
Resources

I need to assign a resource to either / or a department or staff member is the correct way to do this add 2 foreign keys to the resources and make the foriegn keys non requied.

Or do I need to use some kind of link table.

Liam