LC 596超过5名学生的课Classes With at Least 5 Students　简单

Courses 表记录学生选课；列出选课学生不少于 5 人的课程。

思路 GROUP BY class + HAVING COUNT(DISTINCT student) >= 5。

SELECT class
FROM Courses
GROUP BY class
HAVING COUNT(DISTINCT student) >= 5;

数据表：Courses　·　关键字：列出选课学生不少于 5 人的课程