title: Confusion re PK (primary key) and CK (candidate key) for FDs (functional dependencies) in R={A,B,C,D,E,F}
body: <p>I have a confusion re the question below since according to me maybe its answer is that AD is a candidate key. But it is the primary key so I want to know: Is its candidate key the same as its primary key?</p>
  
  <p>A relation R={A,B,C,D,E,F} is given with following set of functional dependencies</p>
  
  <p>A->B<br>
  AD->C<br>
  B->F<br>
  A->E  </p>
  
  <p>What will be its candidate key? Will it be same as its primary key?</p>