596.Classes More Than 5 Students

596.Classed More Than 5 Students

难度:Easy

SQL架构 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.

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

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