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Leetcodesql: count the number of students in each major

2022-06-12 18:59:00 【Review of the white speed Dragon King】

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Ideas ：
Simple 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
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