[Programmers Lv.4] 저자 별 카테고리 별 매출액 집계하기 - 144856

Question

 

2022년 1월의 도서 판매 데이터를 기준으로 저자 별, 카테고리 별 매출액(TOTAL_SALES = 판매량 * 판매가) 을 구하여, 저자 ID(AUTHOR_ID), 저자명(AUTHOR_NAME), 카테고리(CATEGORY), 매출액(SALES) 리스트를 출력하는 SQL문을 작성해주세요.
결과는 저자 ID를 오름차순으로, 저자 ID가 같다면 카테고리를 내림차순 정렬해주세요.

 

Code (After 25.06.)

 

SELECT A.AUTHOR_ID
        , A.AUTHOR_NAME
        , CATEGORY
        , SUM(PRICE * SALES) AS TOTAL_SALES
FROM (SELECT * FROM BOOK_SALES WHERE SALES_DATE LIKE '2022-01%') S
LEFT JOIN BOOK B ON S.BOOK_ID = B.BOOK_ID
LEFT JOIN AUTHOR A ON B.AUTHOR_ID = A.AUTHOR_ID

GROUP BY 1, 2, 3
ORDER BY 1, 3 DESC

 

Code (Before)

 

SELECT A.AUTHOR_ID, AUTHOR_NAME, CATEGORY, SUM(PRICE*SALES) AS TOTAL_SALES
    FROM BOOK B
    JOIN AUTHOR A ON B.AUTHOR_ID = A.AUTHOR_ID
    JOIN BOOK_SALES S ON B.BOOK_ID = S.BOOK_ID
    WHERE SALES_DATE LIKE '2022-01%'
    
    GROUP BY A.AUTHOR_ID, CATEGORY
    ORDER BY A.AUTHOR_ID, CATEGORY DESC

 

now me

On my github