자동차 평균 대여 기간 구하기(String, Date)

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

프로그래머스

 

난이도: 레벨2

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;