title: Ternary and binary ER relationships
body: <p>I'm having trouble understanding the difference between a ternary relationship like this :</p>
  
  <p><a href="https://i.stack.imgur.com/dPPDU.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/dPPDU.png" alt="enter image description here"></a></p>
  
  <p>and multiple binary relationships like this (if that's right) : 
  <a href="https://i.stack.imgur.com/pfitG.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/pfitG.png" alt="enter image description here"></a></p>
  
  <p>From what I've been reading I think it has to do something with constraints? If someone can explain the difference to me clearly I would greatly appreciate it.</p>