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;
Denne forespørgsel returnerer afdelings-id'et, og fordi jeg grupperer efter afdelings-id, vil antallet af medarbejdere, der tilhører hver afdeling, blive returneret
Output vil se nogenlunde sådan her ud
Department_Id | # of Employees
1 7
2 6
4 9