[Programmers/Oracle] Level 4 - 주문량이 많은 아이스크림들 조회하기

✔️ Question

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

프로그래머스

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

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👨‍💻 Solution

1. FETCH 사용

SELECT A.FLAVOR
FROM FIRST_HALF A
INNER JOIN JULY B
ON A.FLAVOR = B.FLAVOR
GROUP BY A.FLAVOR
ORDER BY SUM(B.TOTAL_ORDER + A.TOTAL_ORDER) DESC
FETCH FIRST 3 ROW ONLY;

 

2. ROWNUM 사용

SELECT *
FROM (SELECT A.FLAVOR
    FROM FIRST_HALF A
    INNER JOIN JULY B
    ON A.FLAVOR = B.FLAVOR
    GROUP BY A.FLAVOR
    ORDER BY SUM(B.TOTAL_ORDER + A.TOTAL_ORDER) DESC
)
WHERE ROWNUM <= 3;