[GROUP BY] 조건에 맞는 사용자와 총 거래금액 조회하기: 프로그래머스

https://school.programmers.co.kr/learn/courses/30/lessons/164668

SELECT B.USER_ID, B.NICKNAME, SUM(A.PRICE) AS TOTAL_SALES
FROM USED_GOODS_BOARD A LEFT JOIN USED_GOODS_USER B ON A.WRITER_ID = B.USER_ID
WHERE STATUS = 'DONE'
GROUP BY A.WRITER_ID
HAVING TOTAL_SALES >= 700000
ORDER BY TOTAL_SALES