SELECT department_ID, count(employee_id) as '# of Employees' FROM EMPLOYEES
WHERE DEPARTMENT_ID IN
(
SELECT DEPARTMENT_ID
FROM EMPLOYEES
GROUP BY DEPARTMENT_ID
HAVING COUNT(*)>5
)
AND HIRE_DATE NOT LIKE '%JAN%'
group by department_ID;
Cette requête renvoie le department_id et parce que je regroupe par department_id, le nombre d'employés appartenant à chaque département sera renvoyé
La sortie ressemblera à ceci
Department_Id | # of Employees
1 7
2 6
4 9