title: Joining cells together to shorten result in sql
body: <p>Let's say my select statement in t-sql returns</p>
  
  <pre><code>John Smith | Chicago | a  
  John Smith | Chicago | f  
  John Smith | Chicago | j  
  Josh Dude  | Houston | p  
  Josh Dude  | Houston | s  
  </code></pre>
  
  <p>And I want it to return </p>
  
  <pre><code>John Smith | Chicago | a, f, j  
  Josh Dude  | Houston | p, s
  </code></pre>
  
  <p>How would I do that?</p>