>select * from tests t1 ;
>	where ;
>	score = (select min(score) from tests t2 where t1.student = t2.student) ;
>	or ;
>	score = (select max(score) from tests t2 where t1.student = t2.student)
>
>* Not in older versions
>select t1.* from tests t1 ;
>	INNER join ;
>	(select student, max(score) as maxScore, min(score) as minScore ;
>	from tests group by 1) t2 ;
>	on t1.student = t2.student and (t1.score = t2.maxScore or t1.score = t2.minScore)
>