144855.md

프로그래머스 144855

'카테고리 별 도서 판매량 집계하기'

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

SELECT B.CATEGORY, SUM(BS.SALES) AS TOTAL_SALES
FROM BOOK_SALES AS BS
LEFT JOIN BOOK B ON BS.BOOK_ID=B.BOOK_ID
WHERE SALES_DATE LIKE '2022-01%'
GROUP BY B.CATEGORY
ORDER BY B.CATEGORY ASC