title: 2NF with a transitive dependency?
body: <p>Tomorrow I have my final exam of Database Design but I have a doubt about the Second Normal Form (2NF).</p>
  
  <p>The definition says a relation is in 2NF if no non-prime attribute is partially dependent on a key.</p>
  
  <p>My doubt is about if a relation could be in 2NF is if has attributes that are fully dependent on a key but transitively.</p>
  
  <p>For example:
  R (A,B,C,D) with AB key and FD ( AB->C,C->D) </p>
  
  <p>In this case the non-prime attribute C is fully dependent on the key so it meets the condition but in the case of the attribute D I don´t know if it meets the rule.
   D is dependent on C and due to C is fully dependent on the key,does it mean that D is fully dependent on the key being this relation in 2NF?</p>