Formatted question description: https://leetcode.ca/all/596.html

# 596. Classes More Than 5 Students

## Level

Easy

## Description

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 |
+---------+
```

**Note:**

The students should not be counted duplicate in each course.

## Solution

Select from table `courses`

where the value of `class`

occurs more than or equal to 5 times. To remove duplicate students, use `count(distinct student)`

.

```
# Write your MySQL query statement below
select class from courses group by class having count(distinct student) >= 5;
```