596. Classes More Than 5 Students
这道题是需要输出class，所输出的class的要求是对应的student个数要>=5，因此很容易想到要根据class 进行GROUP BY，并根据COUNT(student)进行筛选。
值的注意的是，我们还需要使用DISTINCT关键字对student进行去重操作，因为测试样例中包含这种重复情况。
# Write your MySQL query statement below
SELECT class FROM courses GROUP BY class HAVING COUNT(DISTINCT student)>=5;
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本文标题：596. Classes More Than 5 Student
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