LeetCode: Classes More Than 5 Students Posted on February 12, 2018July 26, 2020 by braindenny Classes More Than 5 Students Similar Problems: CheatSheet: SQL & MySql CheatSheet: Leetcode For Code Interview CheatSheet: Common Code Problems & Follow-ups Tag: #sql 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. Github: code.dennyzhang.com Credits To: leetcode.com Leave me comments, if you have better ways to solve. ## https://code.dennyzhang.com/classes-more-than-5-students select class from courses group by class having count(distinct student)>=5; Post Views: 4