title: Candidate and Superkey
body: <p><strong>Given a relation schema R with n attributes R(A1, A2, ..., An). What’s the maximum number of possible super-keys for R? Please justify your answer.</strong></p>
  
  <p><strong>Given a relation schema R with n attributes R(A1, A2, ..., An). What’s the maximum number of possible candidate keys for R? Please justify your answer.</strong></p>
  
  <p>I am still wondering on how to answer both of these questions. What I have thought as answer for the first question would be (2^n) - 1 because empty set is not included.</p>
  
  <p>As for the second question. My answer would be n atrributes.</p>
  
  <p>What do you guys think?</p>