There is a table `courses`

with columns: **student** and **class**

Please list out all classes which have more than or equal to 5 students.

For example, the table:

+———+————+ | student | class | +———+————+ | A | Math | | B | English | | C | Math | | D | Biology | | E | Math | | F | Computer | | G | Math | | H | Math | | I | Math | +———+————+

Should output:

+———+ | class | +———+ | Math | +———+

Link: https://leetcode.com/problems/classes-more-than-5-students/

## Solution #

select class from courses group by class having count(distinct student) >= 5;