[MYSQL] PGS - 자동차 대여 기록에서 대여중 / 대여 가능 여부 구분하기

https://school.programmers.co.kr/learn/courses/30/lessons/157340

프로그래머스

SELECT CAR_ID, 
    MAX(CASE WHEN CAR_ID IN (SELECT CAR_ID
                        FROM CAR_RENTAL_COMPANY_RENTAL_HISTORY
                        WHERE DATE_FORMAT(START_DATE,'%Y-%m-%d')<='2022-10-16' AND DATE_FORMAT(END_DATE,'%Y-%m-%d')>='2022-10-16') THEN '대여중'
        ELSE '대여 가능' 
        END) AS AVAILABILITY
FROM CAR_RENTAL_COMPANY_RENTAL_HISTORY
GROUP BY CAR_ID
ORDER BY CAR_ID DESC;

<사용한 것>

• 날짜 비교
• IN
• 서브쿼리