-- TRY IT ..
SELECT CA.NAME, BB.BNAME, BB.PRICE
  FROM CARD CA,
       (SELECT *
          FROM (SELECT BR.CNO,
                       BO.BNAME,
                       BO.PRICE,
                       ROW_NUMBER() OVER(PARTITION BY BR.CNO ORDER BY BO.PRICE DESC) RN
                  FROM BOOKS BO, BORROW BR
                 WHERE BO.BNO = BR.BNO) RR
         WHERE RN = 1) BB
 WHERE CA.CNO = BB.CNO;