title: Why can't I get the right answer in this SQLzoo tutorial?
body: <p><a href="http://sqlzoo.net/2b.htm" rel="nofollow noreferrer">Problem 2b</a> goes as follows:</p>
  
  <blockquote>
    <p>2b. For each subject show the first year that the prize was awarded.</p>
    
    <blockquote>
      <p>nobel(yr, subject, winner)</p>
    </blockquote>
  </blockquote>
  
  <p>My solution was this:<br />
  <code>
      SELECT DISTINCT subject, yr<br />
      FROM nobel<br />
      ORDER BY yr ASC;</code></p>
  
  <p>Why isn't this working?</p>