Question

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, each of whom is identified by a unique
member number and is described by an e-mail address, name, password,
home address, and 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,
a description, 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 hierarchy (for
example, a modem may be classified as COMPUTER → HARDWARE →
MODEM).
■ Buyers make bids for items they are interested in. Bid price and time of
bid are recorded. The bidder at the end of the auction with the highest bid
price is declared the winner, and a transaction between buyer and seller
may then proceed.
■ The buyer and seller may record feedback regarding their completed
transactions. Feedback contains a rating of the other party participating
in the transaction (1–10) and a comment.

Design an enhanced entity–relationship diagram for the ONLINE_AUCTION
database and build the design using a data modeling tool such as ERwin or
Rational Rose. Also decompose to 3NF.

Answer 1

eedbac Comment Transaction eedbac Score Item Takes Part In Bid Increment Auction Start Date riptio ember Number 1 Starting Bid uction En Date Item Title Ema Address (2,2) Item Number Categories Name ank Account Number Member Item Password nk Routing Number Home Address hone Number Seller 1 Lists pping Address Buyer 1 Bids on Bid Price Time of Bid