문제 풀이

SELECT 
    HISTORY_ID, 
    CAR_ID, 
    DATE_FORMAT(START_DATE, '%Y-%m-%d') AS START_DATE, 
    DATE_FORMAT(END_DATE, '%Y-%m-%d') AS END_DATE,
    CASE WHEN DATEDIFF(END_DATE, START_DATE) < 29 then '단기 대여' 
    ELSE '장기 대여' 
    END AS RENT_TYPE
FROM CAR_RENTAL_COMPANY_RENTAL_HISTORY
WHERE START_DATE LIKE '2022-09-%'
ORDER BY HISTORY_ID DESC

문제 출처: https://school.programmers.co.kr/learn/courses/30/lessons/151138