`id` int(255) NOT NULL AUTO_INCREMENT,
  `login` varchar(50) NOT NULL,
  `password` varchar(50) NOT NULL,
  `email` varchar(50) NOT NULL,
  `skype` text,
  `balance` float(255,0) DEFAULT NULL,
  `access` int(11) DEFAULT NULL,
  `avatar` text,
  `name` text CHARACTER SET cp1251,
  `firstname` text CHARACTER SET cp1251,
  `phone` text,
  `sponsor` text,
  `level` int(11) DEFAULT NULL,

select * 
from mYtABLE t
where (select COUNT(*) from mYtABLE i where i.sponsor=t.sponsor and i.id>=t.id)<6
order by sponsor, id desc