* $del = CRM_Utils_SQL_Delete::from('civicrm_activity act')
* ->where('activity_type_id = #type', array('type' => 234))
* ->where('status_id IN (#statuses)', array('statuses' => array(1,2,3))
* $del = CRM_Utils_SQL_Delete::from('civicrm_activity act')
* ->where('activity_type_id = #type', array('type' => 234))
* ->where('status_id IN (#statuses)', array('statuses' => array(1,2,3))