Consider the following tables: DEPARTMENT (DepartmentName, BudgetCode, OfficeNumber, Phone) EMPLOYEE (EmployeeNumber, FirstName, LastName, Department, Phone, Email) PROJECT (ProjectID, Name, Department, MaxHours, StartDate, EndDate) ASSIGNMENT (ProjectID, EmployeeNumber, HoursWorked)

1) Identify the foreign keys in this schema. Explain how the entity and referential integrity rules apply to these relations.

2) Produce some sample tables for these relations that observe the relational integrity rules. Suggest some general constraints that would be appropriate for this schema.