조회수가 가장 많은 중고거래 게시판의 첨부파일 조회하기

SELECT CONCAT('/home/grep/src/', A.BOARD_ID, '/',
              B.FILE_ID, B.FILE_NAME, B.FILE_EXT) AS FILE_PATH
FROM USED_GOODS_BOARD A JOIN USED_GOODS_FILE B
ON A.BOARD_ID = B.BOARD_ID
WHERE A.VIEWS IN (SELECT MAX(VIEWS)
                 FROM USED_GOODS_BOARD)
ORDER BY B.FILE_ID DESC;