20240704 풀이-- 코드를 입력하세요SELECT B.USER_ID , B.NICKNAME , CONCAT(B.CITY, ' ', B.STREET_ADDRESS1, ' ', B.STREET_ADDRESS2) '전체주소' , CONCAT(SUBSTR(B.TLNO, 1, 3), '-', SUBSTR(B.TLNO, 4, 4), '-', SUBSTR(B.TLNO, 8, 4)) '전화번호'FROM USED_GOODS_BOARD A JOIN USED_GOODS_USER B ON A.WRITER_ID = B.USER_IDGROUP BY B.USER_IDHAVING COUNT(A.WRITER_ID) >= 3ORDER BY 1 DESC20240820 풀이-- 중고 거래 게시물 3건 이상 등록-..