title: database normalization, numerical primary key or string
body: <p>I had to argue with my professor about this, but he insist that my solution was anomalous and may cause conflicts. He added that I fail at understanding the concept of database designing.</p>
  
  <p>But then, he is unable to explain to me why his solution is correct whilst mine is wrong.</p>
  
  <p>The question is about database normalization of the following kena database table:</p>
  
  <p><img src="https://i.stack.imgur.com/HWMIw.png" alt="Question"></p>
  
  <p>And MY answer on the left side, and the Professor's answer on the right side:</p>
  
  <p><img src="https://i.stack.imgur.com/qkG6s.png" alt="Answers"></p>
  
  <p>Better View: 
  <a href="http://tny.cz/48c4a28b" rel="nofollow noreferrer">http://tny.cz/48c4a28b</a></p>
  
  <p>What do you think is my mistake and why do you think he said that my answer is far from correct?</p>