MySQL slow query using filesort

Question

I have speed problems with a MySQL query. The tables definitions are as follows:

CREATE TABLE IF NOT EXISTS `student` (
  `student_id` int(11) unsigned NOT NULL          


        

Answer 1

I can't test this very easily, but try using this student_sort key:

KEYstudent_sort(student_college,countupDESC ,updated_timeDESC)