596 Classes More Than 5 Students

1. Description

Table: Courses

+-------------+---------+
| Column Name | Type    |
+-------------+---------+
| student     | varchar |
| class       | varchar |
+-------------+---------+
(student, class) is the primary key column for this table.
Each row of this table indicates the name of a student and the class in which they are enrolled.

 

Write an SQL query to report all the classes that have at least five students.

Return the result table in any order.

The query result format is in the following example.

 

2. Algorithms

GROUP BY clause can aggregate records by distinct value of input column. While we aggregate record, we can extract specific rows using HAVING cluase.

 

3. Codes

# Write your MySQL query statement below
SELECT class 
  FROM Courses
 GROUP BY class 
 HAVING COUNT(*) >= 5;

 

4. Conclusion