$tmp=$app->db->queryOneRecord("SELECT sum(quota) as mailquota FROM mail_user, sys_group, client WHERE mail_user.sys_groupid=sys_group.groupid AND sys_group.client_id=client.client_id AND ? IN (client.parent_client_id, client.client_id) AND mailuser_id != ?",$client['parent_client_id'],$this->id);