You are a systems designer and have a friend who owns a small bookstore and mail-order business spectializing in rare books and first editions. Total sales average about a dozen books per day, store and mail order combined. Your friend wants to start selling books over the Web also, and has come to you for advice. He has heard that he should go with a relational database and that Oracle is the best one to get. Do you concur? If not, what would you recommend?