Top Scorer per Subject

For each subject return the student(s) with the highest marks (include ties). Order by subject then student.

Table schema

Marks(student VARCHAR(20), subject VARCHAR(20), marks INT)

Sample data

student | subject | marks
Asha | Math | 90
Ben | Math | 85
Asha | Physics | 70
Ben | Physics | 88
Chitra | Physics | 88