tailieunhanh - Activity 5.1: Identifying Keys in the Logical Model

In this activity, you will identify primary, foreign, and (if necessary) composite keys in the logical data model for Ferguson and Bardell, Inc. | Activity Identifying Keys in the Logical Model In this activity you will identify primary foreign and if necessary composite keys in the logical data model for Ferguson and Bardell Inc. Objectives After completing this activity you will be able to Identify primary foreign and composite keys in a logical data model. Select a primary and foreign key type that is appropriate for a given entity. Before You Begin This activity will be completed individually with a class discussion to follow. Time to complete this activity 20 minutes 22 Activity Identifying Keys in the Logical Model Exercise 1 Identifying Keys In this exercise you will identify primary foreign and composite keys for a logical data model based on the Ferguson and Bardell Inc. case study. Specify the keys in a logical data model 1. Review the ER diagram on the next page. 2. Identify the areas of the ER diagram for which keys are necessary. 3. Write the keys in the space provided on the ER diagram. 4. Label each key as necessary using the following syntax Primary Key PK Foreign Key FK Composite Key CK Draw a line under the attributes used to define the composite key and then label their types as Primary or Foreign. Next you will discuss your answers with the class. Activity Identifying Keys in the Logical Model 23 Employee Name Address SSN E-Mail Type Salary BillableRate 1 Contract Contracts With 1. Is Issued Vehicle Timesheet Invoice __Completes 1 EmployeeFirstName EmployeeLastName ClientName ClientLocation ClientName ClientAddress ClientCity ClientState Date Expenses TotalHours BillableHours Description ClientZip Date Amount Work Description Is Made From 1 1 0. Client Employee StartDate EndDate Description 1. Purchases Make Model VIN Year BeginMileage EndMileage MaintenanceCost1 MaintenanceDesc1 MaintenanceDate1 MaintenanceMiles1 MaintenanceCost2 MaintenanceDesc2 MaintenanceDate2 MaintenanceMiles2 MaintenanceCost3 MaintenanceDesc3 MaintenanceDate3 MaintenanceMiles3 Bills .

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