ERD 2: Consider an online auction database system in which members (buyers and sellers) participate in the sale of items. The data requirements for this system are summarized as follows: The online site has members who are identified by a unique member id and are described by an email address, their name, a password, their home address, and a phone number. A member may be a buyer or a seller. A buyer has a shipping address recorded in the database. A seller has a bank account number and routing number recorded in the database. Items are placed by a seller for sale and are identified by a unique item number assigned by the system. Items are also described by an item title, an item description, a starting bid price, bidding increment, the start date of the auction, and the end date of the auction. Items are also categorized based on a fixed classification hierarc hy (for example a modem may be classified as computer/ hardware/ modem). Buyers make bids for items they are interested in. A bidding price and time of bid placement is recorde d. The person at the end of the auction with the highest bid price is declared th e winner and a t ransaction between the buyer and the seller may proceed soon after. Buyers and sellers may place feedback ratings on the purchase or sale of a n item. The feedb ack conta ins a rating between 1 and 1 0 and a comment. Note that the ratings are placed on a completed transaction by the buyer or seller of the item in the transaction.

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