leetcodeSQL:统计各专业学生人数

思路：
简单left join + groupby + orderby

sql

# Write your MySQL query statement below
select dept_name, count(student_id) student_number
from Department t left join Student s 
on s.dept_id = t.dept_id
group by t.dept_name
order by student_number DESC, dept_name ASC

标签：专业,join,name,number,dept,student,leetcodeSQL,人数,id
来源： https://blog.csdn.net/weixin_40986490/article/details/123183663