title: How to quote values using group_concat
body: <p>I need to use group_concat to build a list of comma separated values but I need the values to be quoted. How do I do this?</p>
  
  <p>This:</p>
  
  <pre><code>425,254,431,53,513,13,1,13
  </code></pre>
  
  <p>Should be converted to:</p>
  
  <pre><code>'425','254','431','53','513','13','1','13'
  </code></pre>