title: Converting an ER diagram into relational scheme
body: <p>Currently I'm learning about relational schemes and I converted following ER diagram into a one yet I feel something is missing. I would like to know If I did it correctly or missing anything?</p>
  
  <p><a href="https://i.stack.imgur.com/dGIxe.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/dGIxe.png" alt="ER diagram"></a></p>
  
  <p>and here is the relational scheme I did</p>
  
  <p><a href="https://i.stack.imgur.com/irgxq.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/irgxq.jpg" alt="Relational scheme diagram"></a></p>