title: Remove Comma from STUFF if I ony have one value
body: <p>I would like to remove the comma at the end if there's only one value inside the stuff but, it should exists there's more than one value
  thanks!</p>
  
  <pre><code>select
  Names= (STUFF((
    SELECT ', ' +     CONCAT(
                  CASE WHEN RegistryUser.FirstName IS NOT NULL AND RegistryUser.LastName IS NOT NULL THEN RegistryUser.FirstName ELSE App.FirstName END,
                  ' ',
                  CASE WHEN RegistryUser.FirstName IS NOT NULL AND RegistryUser.LastName IS NOT NULL THEN RegistryUser.LastName ELSE App.LastName END
              ) AS Names
      FROM ConsultingEventConsultant
              LEFT JOIN App
                  ON ConsultingEventConsultant.AppID = App.AppID
              LEFT JOIN RegistryUser
                  ON App.UserID = RegistryUser.UserID
              WHERE ConsultingEventConsultant.consultingeventid = 56428 
              and ConsultingEventConsultant.CECID != (SELECT TOP 1 CECID FROM ConsultingEventConsultant CEC WHERE CEC.ConsultingEventID = 56428 ORDER BY CECID)
                FOR XML PATH(''), TYPE).value('.', 'NVARCHAR(MAX)'
               ), 1, 1, ''))
  </code></pre>
  
  <p>John Doe</p>
  
  <p>John Doe, Sara Smith</p>