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categoryقواعد البيانات وإدارة البيانات schoolبكالوريوس event_available2026-07-13

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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. 1. Design EER diagram 2. Map your EER diagram into relational schema and specify all primary keys and foreign keys 3. Decompose your relations to 3NF 4. Create the relations using SQL statement in MS ACCESS and input at least 15 records for each relation. Make sure your input results in at least one output for each SQL statements for question # 6. 5. Create simple forms in MS ACCESS for your database 6. Write SQL statements to retrieve the following: a. Name of all sellers b. Name of all buyers c. Name of sellers who have given a rating of 1 d. Name of buyers who have received a rating of 1

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