Show all majors and corresponding number of students.
SELECT major ,  count(*) FROM Student GROUP BY major
SELECT major ,  count(*) FROM Student GROUP BY major
[{'Major': 50, 'count(*)': 2}, {'Major': 100, 'count(*)': 1}, {'Major': 520, 'count(*)': 6}, {'Major': 540, 'count(*)': 2}, {'Major': 550, 'count(*)': 5}, {'Major': 600, 'count(*)': 18}]