title: How To Concatenate this Sql Column into Single cell?
body: <pre><code>ClassName    BookCode
  First          2
  Second         2
  Third          2
  First          3
  Fourth         3
  Fifth          3
  </code></pre>
  
  <p>I want to concatenate this into like this :</p>
  
  <pre><code>ClassName             BookCode
  First,Second,Third       2
  First,Fourth,Fifth       3
  </code></pre>