Grupo por columnas de unión por tabla
SELECT
e.department_id,
department_name,
e.job_id,
job_title,
COUNT(employee_id)
FROM
employees e
INNER JOIN
departments d ON d.department_id = e.department_id
INNER JOIN
jobs j ON j.job_id = e.job_id
GROUP BY e.department_id , e.job_id;
Code language: SQL (Structured Query Language) (sql)
Concerned Chinchilla