596. Classes More Than 5 Students

* Problem

Write a solution to find all the classes that have at least five students.
Return the result table in any order.

* Explanation

- Math has 6 students, so we include it.
- English has 1 student, so we do not include it.
- Biology has 1 student, so we do not include it.
- Computer has 1 student, so we do not include it.

* Solution (Success)

SELECT class
FROM Courses
GROUP BY 1
HAVING COUNT(*) >= 5;