title: Query for find the decade with the largest number of records
body: <p>I have a database including the following tables:</p>
  
  <pre><code>ACTOR (id, fname, lname, gender)
  MOVIE (id, name, year, rank)
  DIRECTOR (id, fname, lname)
  CAST (a_id, m_id, role)
  MOVIE_DIRECTOR (d_id, m_id)
  </code></pre>
  
  <p>Now I want to retrieve the data of the following question.</p>
  
  <blockquote>
    <p>A decade is a sequence of 10 consecutive years. For example, 1965, 1966, ..., 1974 is a decade, and so is 1967, 1968, ..., 1976. Find the decade with the largest number of films</p>
  </blockquote>