주문량이 많은 아이스크림들 조회하기

https://school.programmers.co.kr/learn/courses/30/lessons/133027

프로그래머스

[문제]

7월 아이스크림 총 주문량과 상반기의 아이스크림 총 주문량을 더한 값이 큰 순서대로 상위 3개의 맛을 조회하는 SQL 문을 작성해주세요.

 

[나의 풀이]

SELECT FLAVOR
FROM(
SELECT FLAVOR, SUM(TOTAL_ORDER) TOTAL
FROM (SELECT FLAVOR, TOTAL_ORDER
      FROM FIRST_HALF
         
      UNION ALL
         
      SELECT FLAVOR, TOTAL_ORDER
      FROM JULY) AS A
GROUP BY FLAVOR
ORDER BY TOTAL DESC
) AS B
LIMIT 3;

 

[다른 풀이]

SELECT A.FLAVOR
FROM FIRST_HALF A
JOIN(
    SELECT FLAVOR, SUM(TOTAL_ORDER) AS TOTAL_ORDER
    FROM JULY
    GROUP BY FLAVOR) B
ON A.FLAVOR = B.FLAVOR
ORDER BY (A.TOTAL_ORDER+B.TOTAL_ORDER) DESC
LIMIT 3;

 

 

SELECT F.FLAVOR
FROM FIRST_HALF AS F
JOIN JULY AS J
ON F.FLAVOR = J.FLAVOR
GROUP BY F.FLAVOR
ORDER BY F.TOTAL_ORDER +SUM(J.TOTAL_ORDER) DESC
LIMIT 3

SELECT A.FLAVOR
FROM (
    SELECT * FROM FIRST_HALF
    UNION ALL
    SELECT * FROM JULY
    ) AS A
GROUP BY A.FLAVOR
ORDER BY SUM(A.TOTAL_ORDER) DESC
LIMIT 3

 

-참고

https://jun-bae.tistory.com/77

[Programmers Lv.4] 주문량이 많은 아이스크림들 조회하기 (MySQL)