MySQL:BEGRÆNSE med en procentdel af antallet af poster?

Bedste svar, jeg fandt:

SELECT*
FROM    (
    SELECT list.*, @counter := @counter +1 AS counter
    FROM (select @counter:=0) AS initvar, list
    ORDER BY value DESC   
) AS X
where counter <= (10/100 * @counter);
ORDER BY value DESC

Skift 10 for at få en anden procentdel.