🔗 https://school.programmers.co.kr/learn/courses/30/lessons/131533
SELECT P.PRODUCT_CODE, SUM(P.PRICE * O.SALES_AMOUNT) AS SALES
FROM PRODUCT P
JOIN OFFLINE_SALE O ON O.PRODUCT_ID = P.PRODUCT_ID
GROUP BY P.PRODUCT_CODE
ORDER BY SALES DESC, P.PRODUCT_CODE ASC