조건에 맞는 사용자와 총 거래금액 조회하기

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

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