Question

(1) Regional Labs is a company that conducts research and development work on a contract basis for other companies and organizations. Figure 3-32 shows data that Regional Labs collects about projects and the employees assigned to them. This data is stored in a relation (table) named PROJECT: ProjectlD FIGURE 3-32 Sample Data for Regional Labs EmployeeName EmployeeSalary 64,000.00 Eric Jones 100-A 100-A Donna Smith 70,000.00 100-B Donna Smith 70,000.00 200-A Eric Jones 64,000.00 64,000.00 Eric Jones 200-B 200-C 200-C Eric Parks 58,000.00 Donna Smith 70,000.00 200-D Eric Parks 58,000.00 1. Assuming that all functional dependencies are apparent in this data. Please list all the functional dependencies in the table in the following format: 2. Please describe the table structure with the table structure notation, as shown below: 3. Does the table violate 1NF? If so correct it (please also put it sentence structure). 4. Does the table in question 3 violate 2NF? If so correct it and describe the new tables with the table structure notation. Example: SKU_DATA ORDER_ITEM (SKU, SKU_Description, Department, Buyer) (OrderNumber, SKU, Quantity, Price, ExtendedPrice) Where ORDER_ITEM.SKU must exist in SKU_DATA.SKU 5. Does the table in question 4 violate 3NF? If so correct it and describe the new tables with the table structure notation.

Answer 1

1. Functional dependencies:

ProjectID ->-> EmployeeName ( multivalue dependency)

EmployeeName -> EmployeeSalary

2.

PROJECT(ProjectID,EmployeeName,EmployeeSalary)

3.

No,the table does not violate 1NF as all attributes are atomic.

4.

Yes, the table violates 2NF as there exists partial dependency

Tables in 2NF

PROJECT(ProjectID , EmployeeName)

EMPLOYEE(EmployeeName , EmployeeSalary)

underlined are primary keys and italicized are foreign keys.

5.

No, the table does not violate 3NF as there exist no transitive dependency.

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