출처

https://school.programmers.co.kr/learn/courses/30/lessons/157342

문제

풀이

SELECT
    CAR_ID,
    ROUND(AVG(DATEDIFF(END_DATE, START_DATE) + 1), 1) AS AVERAGE_DURATION
FROM CAR_RENTAL_COMPANY_RENTAL_HISTORY
GROUP BY CAR_ID
HAVING AVERAGE_DURATION >= 7
ORDER BY AVERAGE_DURATION DESC, CAR_ID DESC