title: Supertype/subtype database schema question
body: <p>I have a database of resources with the typical address, email and all that jazz.  One resources can be used by one or more counties.  The resources are categorized by Education, Health Care and a couple others.  A resource will only ever have one category so it cannot be education and health care, for instance.  I would like to use the supertype/subtype relationship.  Currently, no category (health care, education etc.) do not have any differing attributes.  How could I amend my schema to accommodate that?</p>
  
  <p>below is a screen cap of my current schema.
  <a href="http://imgur.com/fbrFB" rel="nofollow">http://imgur.com/fbrFB</a></p>