【LeetCode】596、Classes More Than 5 Students
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题目要求：
There is a table courses with columns: student and class
Please list out all classes which have more than or equal to 5 students.
解答：COUNT与 DISTINCT组合使用，满足The students should not be counted duplicate in each course.的要求。也可以用组合查询。
COUNT 语法：http://www.w3school.com.cn/sql/sql_func_count.asp
SELECT class FROM coursesGROUP BY classHAVING COUNT(DISTINCT(student)) >= 5
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