LeetCode 1076 'Project Employees II' Meta Interview SQL Question with Explanation

In this video I solve and explain a leetcode SQL question using MySQL query. This question has been asked in Apple, Facebook, Amazon, Google, Adobe, Microsoft, Adobe interviews or what we popularly call FAANG interviews.
I explain the related concept as well. This question includes points to keep in mind to develop SQL queries.

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[minadell]

select project_id, count(emp_id) from project group by project_id order by emp_id desc limit 1;

[hrithvik]

SELECT
p.project_id,
ROUND(AVG(e.experience_years), 2) AS average_years
FROM
Project p
JOIN
Employee e
ON
p.employee_id = e.employee_id
GROUP BY
p.project_id;