title: How can I share the same primary key across two tables?
body: <p>I'm reading a book on <a href="https://en.wikipedia.org/wiki/Entity_Framework" rel="nofollow noreferrer">EF4</a> and I came across this problem situation:</p>
  
  <p><img src="https://i.stack.imgur.com/v6XM9.jpg" alt="enter image description here"></p>
  
  <p>So I was wondering how to create this database so I can follow along with the example in the book. </p>
  
  <p>How would I create these tables, using simple TSQL commands? Forget about creating the database, imagine it already exists.</p>