답 쿼리입니다.
SELECT DISTINCT CC.CAR_ID FROM CAR_RENTAL_COMPANY_CAR CC JOIN CAR_RENTAL_COMPANY_RENTAL_HISTORY RH ON CC.CAR_ID = RH.CAR_ID WHERE CC.CAR_TYPE = '세단' AND MONTH(RH.START_DATE) = 10 ORDER BY CAR_ID DESC