MySQL LEFT JOIN with GROUP BY and WHERE clause query

Question

Tables that look like bellow

How to write SQL Query to read all department names with an employee count salary > 1000, if a department not found in employee we required to show as zero counts in output.

Answer 1

You can use left join and aggregation:

select d.name, count(e.id)
from departments d left join
     employees e
     on e.department_id = d.id and e.salary >= 10000
group by d.name