include aninventory system that will allow multiple units of an item to be stored under one ItemID. Thesystem should allow for a quantity on hand, a quantity on order, and an order due date. Ifthe identical item is stocked by multiple vendors, the item should be orderable from any ofthese vendors. The SALE_ITEM table should then include Quantity and ExtendedPricecolumns to allow for sales of multiple units of an item.The Queen Anne Curiosity Shop management has noticed that some of the fields inCUSTOMER and EMPLOYEE store similar data. Under the current system, when an employeebuys something at the store, his or her data has to be reentered into the CUSTOMER table.The managers would like to have the CUSTOMER and EMPLOYEE tables redesigned usingsubtypes:a. Draw an E-R data model for The Queen Anne Curiosity Shop database schemashown in Chapter 3?s ?The Queen Anne Curiosity Shop Project Questions.? Usethe IE Crow?s Foot E-R model for your E-R diagrams. Justify the decisions youmake regarding minimum and maximum cardinality.b. Extend and modify the E-R data model by adding only The Queen Anne CuriosityShop?s inventory system requirements. Use the IE Crow?s Foot E-R model for Database I: CSIS2300your E-R diagrams. Create appropriate identifiers and attributes for each entity.Justify the decisions you make regarding minimum and maximum cardinality.c. Extend and modify the E-R data model by adding only The Queen Anne CuriosityShop?s need for more efficient storage of CUSTOMER and EMPLOYEE data. Usethe IE Crow?s Foot E-R model for your E-R diagrams. Create appropriateidentifiers and attributes for each entity. Justify the decisions you makeregarding minimum and maximum cardinality.d. Combine the E-R data models from parts B and C to meet all of The Queen AnneCuriosity Shop?s new requirements, making additional modifications, as needed.Use the IE Crow?s Foot E-R model for your E-R diagrams.e. Describe how you would go about validating your data model in part D.
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