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Monday, October 22nd, 2007more than one item at the same time. There are also special types of auctions where a single listing can list multiple items for sale to multiple possible bidders, depending on how many items a bidder wishes to buy. Figure 9-4: Sellers, listings, and seller history (dynamic information moving through the database model). Auction House Buyers Buyers have various items of information: . Buyers should have bidding records so that sellers can verify they are dealing with a reputable buyer. It is prudent for sellers to avoid accepting bids on items for buyers who have, for example, placed bids in the past without making payment. . The auction site needs to store buyer information such as names, addresses, credit card information, and credit worthiness. Figure 9-5 shows the relationships between a buyer, bids made on existing listings, and a history of past dealings with buyers. Any listing can have more than one bid made on it during the life of the listing. When the auction is complete and there is an auction winner, no more bids are allowed. A listing may have no bids at all, at which stage it can be listed again. Figure 9-5: Buyers, listings, bids, and buyer history (dynamic information moving through the database model). Buyer Listing Bids Buyers have a history based on comments made by past sellers Each listing can have many bids made on it whilst it is listed for auction Buyer History Seller Listing Sellers have a history based on comments made by past buyers Sellers can list many items at once or over time Seller History 231 Planning and Preparation Through Analysis
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