title: How to use NOT FIND_IN_SET in Laravel 5.1?
body: <p>As we use FIND_IN_SET to search in comma separated values in Laravel like:</p>
  
  <pre><code>-&gt;whereRaw('FIND_IN_SET(2,sent_mail_ids)')
  </code></pre>
  
  <p>But now I want to get those results which do not exist in comma separated values. To do this we use NOT FIND_IN_SET in MySQL, but how to use this in Laravel?</p>