title: mySql IN clause
body: <p>Anybody know why this won't work:</p>
  
  <pre><code>SELECT clients_id FROM clients WHERE 34 IN (clients_groups)
  </code></pre>
  
  <p>I'm storing client group id's in the text column 'clients_groups' as 34,35,42 etc. The statement works correctly when there is only one value in clients_groups, but otherwise returns 'not found'.</p>