select->from( array('sfh' => $this->prefix . 'flappinghistory'), array() )->join( array('so' => $this->prefix . 'objects'), 'so.object_id = sfh.object_id AND so.is_active = 1 AND so.objecttype_id = 2', array() ); $this->select->where('sfh.event_type = 1001'); $this->joinedVirtualTables['flappinghistory'] = true; $this->columnMap['flappinghistory']['type'] = '(\'flapping_deleted\')'; } }