title: Who represent an ISA relationship in Relation Model?
body: <p><a href="https://i.stack.imgur.com/XUea3.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/XUea3.png" alt="enter image description here"></a></p>
  
  <p>I have this example</p>
  
  <p>In the Secretary, i need to create and id? Who represent in WorkBench?</p>
  
  <p>Or i only need to create <code>1:n</code> relationship?</p>
  
  <p>My model have:</p>
  
  <pre><code>Engineer : eng_type, fk: employee_ssn
  </code></pre>