title: return multiple records as one string in query
body: <pre><code>students: id, last_name
  
  1 Robinson
  2 Norris
  3 Smith
  
  sports: id, title
  
  1 Basketball 
  2 Baseball
  3 Football
  
  students_sports: student_id, sport_id
  
  1 3
  1 2
  2 1
  2 3
  3 3
  3 1
  </code></pre>
  
  <p>This query</p>
  
  <pre><code>select 
   last_name, sports.title as sport
  from 
   students s
  left join
   students_sports ss
  on
   s.id = ss.student_id
  left join
   sports
  on
   ss.sport_id = sports.id
  </code></pre>
  
  <p>It would return something like:</p>
  
  <pre><code>last_name       sport
  Robinson        basketball
  Robinson        baseball
  Smith           football
  Smith           baseball
  Norris          baseball
  Norris          basketball
  </code></pre>
  
  <p>I want to modify the query to return the results like this:</p>
  
  <pre><code>last_name       sport
  Robinson        basketball, baseball
  Smith           football, baseball
  Norris          baseball, basketball
  </code></pre>