카테고리 별 도서 판매량 집계하기

https://school.programmers.co.kr/learn/courses/30/lessons/144855

프로그래머스

SELECT
    CATEGORY, SUM(SALES) AS TOTAL_SALES
FROM
    BOOK B
JOIN
    BOOK_SALES BS ON B.BOOK_ID = BS.BOOK_ID
WHERE MONTH(SALES_DATE) = 1 AND YEAR(SALES_DATE) = 2022
GROUP BY CATEGORY
ORDER BY CATEGORY ASC;