[SQL] 자동차 평균 대여 기간 구하기

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

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나의 풀이 코드

-- 코드를 입력하세요
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