Find the number of students in one classroom.
SELECT count(*) ,  classroom FROM list GROUP BY classroom
SELECT count(*) ,  classroom FROM list GROUP BY classroom
[{'count(*)': 3, 'Classroom': 101}, {'count(*)': 7, 'Classroom': 102}, {'count(*)': 5, 'Classroom': 103}, {'count(*)': 4, 'Classroom': 104}, {'count(*)': 5, 'Classroom': 105}, {'count(*)': 7, 'Classroom': 106}, {'count(*)': 6, 'Classroom': 107}, {'count(*)': 2, 'Classroom': 108}, {'count(*)': 8, 'Classroom': 109}, {'count(*)': 6, 'Classroom': 110}, {'count(*)': 4, 'Classroom': 111}, {'count(*)': 3, 'Classroom': 112}]