The Queen Anne Curiosity Shop sells both antiques and current-production household items that complement or are useful with the antiques. For example, the store sells antique dining room tables and new tablecloths. The antiques are purchased from both individuals and wholesalers, and the new items are purchased from distributors. The store?s customers include individuals, owners of bed-and-breakfast operations, and local interior designers who work with both individuals and small businesses. The antiques are unique, although some multiple items, such as dining room chairs, may be available as a set (sets are never broken). The new items are not unique, and an item may be reordered if it is out of stock. New items are also available in various sizes and colors (for example, a particular style of tablecloth may be available in several sizes and in a variety of colors).

Figure 2-35 shows typical sales data for the Queen Anne Curiosity Shop, and Figure 2-36 shows typical purchase data.

A. Using these data, state assumptions about functional dependencies among the columns of data. Justify your assumptions on the basis of these sample data and also on the basis of what you know about retail sales.

B. Given your assumptions in part A, comment on the appropriateness of the following designs:

C. Modify what you consider to be the best design in part B to include surrogate ID columns called CustomerID and SaleID. How does this improve the design?

D. Modify the design in part C by breaking SALE into two relations named SALE and SALE_ITEM. Modify columns and add additional columns as you think necessary. How does this improve the design?

E. Given your assumptions, comment on the appropriateness of the following designs:

F. Modify what you consider to be the best design in part E to include surrogate ID columns called PurchaseID and VendorID. How does this improve the design?

G. The relations in your design from part D and part F are not connected. Modify the database design so that sales data and purchase data are related.

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FIGURE 2-35 Sample Sales Data for The Queen Anne Curiosity Shop LastName FirstName Phone InvoiceDate InvoiceItem Price Tax Total Shire Robert 206-524-2433 14-Dec-14 Antique Desk 3,000.00 249.00 3,249.00 Antique Desk Chair Shire Robert 206-524-2433 14-Dec-14 500.00 41.50 541.50 Goodyear Katherine Dining Table Linens 206-524-3544 15-Dec-14 1,000.00 83.00 1,083.00 Bancroft Chris 425-635-9788 15-Dec-14 Candles 50.00 4.15 54.15 Griffith John 206-524-4655 23-Dec-14 Candles 45.00 3.74 48.74 Shire Robert 206-524-2433 5-Jan-15 Desk Lamp 250.00 20.75 270.75 Dining Table Linens Tierney Doris 425-635-8677 10-Jan-15 750.00 62.25 812.25 Anderson Donna 360-538-7566 12-Jan-15 Book Shelf 250.00 20.75 270.75 Goodyear Goodyear 15-Jan-15 15-Jan-15 Antique Chair Antique Chair Katherine 206-524-3544 1,250.00 103.75 1,353.75 Katherine 206-524-3544 1,750.00 145.25 1,895.25 Antique Candle Holders Tierney Doris 425-635-8677 25-Jan-15 350.00 29.05 379.05