title: Merge multiple rows into one column without duplicates
body: <p>I am working on a query that will collect data from a table and display the data for a report.  </p>
  
  <p>The data looks like this:</p>
  
  <pre><code>Player Score
  001      10
  001      20
  002      20
  002      20
  001      10
  002      10
  003      20
  002      20
  001      10
  </code></pre>
  
  <p>I want it to display it like this</p>
  
  <pre><code>Player Score
  001    10,20
  002    10,20
  003    20
  </code></pre>
  
  <p>But all I get is a combined list of all data in the score column like this</p>
  
  <pre><code>Player Score
  001    10,20,10,10
  002    20,20,10,20
  003    20
  </code></pre>
  
  <p>Does anyone have an idea how to make this work?</p>