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💬 문제
https://school.programmers.co.kr/learn/courses/30/lessons/144856
💬 풀이
SELECT A.AUTHOR_ID, A.AUTHOR_NAME, B.CATEGORY, SUM(BS.SALES * B.PRICE) AS TOTAL_SALES
FROM AUTHOR AS A JOIN BOOK AS B JOIN BOOK_SALES AS BS
ON A.AUTHOR_ID = B.AUTHOR_ID AND B.BOOK_ID = BS.BOOK_ID
WHERE BS.SALES_DATE BETWEEN '2022-01-01' AND '2022-01-31'
GROUP BY A.AUTHOR_ID, B.CATEGORY
ORDER BY A.AUTHOR_ID, B.CATEGORY DESC