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https://school.programmers.co.kr/learn/courses/30/lessons/144854

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    SELECT 
        A.BOOK_ID,B.AUTHOR_NAME,
        DATE_FORMAT(A.PUBLISHED_DATE ,'%Y-%m-%d')AS PUBLISHED_DATE
    FROM BOOK A INNER JOIN AUTHOR B
    ON A.AUTHOR_ID=B.AUTHOR_ID
    WHERE A.CATEGORY='경제' 
    ORDER BY PUBLISHED_DATE ASC

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DATE_FORMAT(날짜, '원하는 형식) : 날짜의 형식을 지정할 때 사용한다