성공하긴했는데..

desc와 asc를 헷갈리지 말자. 글을 잘읽도록 하자

-- 코드를 입력하세요
SELECT P.PRODUCT_CODE, SUM(P.PRICE * O.SALES_AMOUNT) AS SALES 
FROM PRODUCT AS P
JOIN OFFLINE_SALE AS O
ON O.PRODUCT_ID= P.PRODUCT_ID
GROUP BY P.PRODUCT_CODE
ORDER BY SALES DESC, P.PRODUCT_CODE