title: Delete items from table without a reference ID
body: <p>I need to delete all the Contributors that don't have a License assigned to them</p>
  
  <pre><code>Table        : Columns
  
  Contributors : [id, Name,...]
  Licenses     : [id, ContributorId, Name, ...]
  </code></pre>
  
  <p>Something like this</p>
  
  <pre><code>DELETE FROM Contributors
  WHERE
  License.ContributorId != Contributor.Id
  </code></pre>