SELECT first_name 이름, commission_pct 커미션, hire_date 입사일, department_name 부서이름
FROM employees e, departments d
WHERE commission_pct IN NOT null OR hire_date <= '05/01/01' AND department_name LIKE 'A%'
AND d.department_id = e.department_id
ORDER BY 3;
기초 공부중인데 ... 무엇이 잘못된 것입니까..