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https://school.programmers.co.kr/learn/courses/30/lessons/157341

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    SELECT DISTINCT A.CAR_ID 
    FROM CAR_RENTAL_COMPANY_CAR A INNER JOIN CAR_RENTAL_COMPANY_RENTAL_HISTORY B
    ON A.CAR_ID=B.CAR_ID
    WHERE A.CAR_TYPE='세단' AND MONTH(B.START_DATE)=10
    ORDER BY CAR_ID DESC

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  • DISTINCT

중복 제거를 의미한다.