Relational Schema: Employee (EmployeeID, FirstName, LastName, Email, Phone, HireDate, Salary, #DepartmentID) Department (DepartmentID, DepartmentName, #ManagerID) Project (ProjectID, ProjectName, StartDate, EndDate, Budget) Employee_Project (#EmployeeID, #ProjectID, Role, AssignmentDate) Explanation of Relationships: Employee (EmployeeID) is the primary key. Department (DepartmentID) is the primary key. Project (ProjectID) is the primary key. Employee_Project (#EmployeeID, #ProjectID) is a composite primary key (many-to-many relationship between Employee and Project). Employee(#DepartmentID) REFERENCES Department(DepartmentID) : An employee belongs to a department. Department(#ManagerID) REFERENCES Employee(EmployeeID) : A manager is an employee. Employee_Project(#EmployeeID) REFERENCES Employee(EmployeeID) Employee_Project(#ProjectID) REFERENCES Project(ProjectID) QUESTION Which query returns the average salary of employees? A) SELECT AVG(Salary) WHERE Employee; B) SELECT MEAN(Salary) FROM Employee; C) SELECT AVG(Salary) FROM Employee GROUP BY Salary; D) SELECT AVG(Salary) FROM Employee;

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Employee (EmployeeID, FirstName, LastName, Email, Phone, HireDate, Salary, #DepartmentID)

Department (DepartmentID, DepartmentName, #ManagerID)

Project (ProjectID, ProjectName, StartDate, EndDate, Budget)

Employee_Project (#EmployeeID, #ProjectID, Role, AssignmentDate)

Employee (EmployeeID) is the primary key.
Department (DepartmentID) is the primary key.
Project (ProjectID) is the primary key.
Employee_Project (#EmployeeID, #ProjectID) is a composite primary key (many-to-many relationship between Employee and Project).
Employee(#DepartmentID) REFERENCES Department(DepartmentID): An employee belongs to a department.
Department(#ManagerID) REFERENCES Employee(EmployeeID): A manager is an employee.
Employee_Project(#EmployeeID) REFERENCES Employee(EmployeeID)
Employee_Project(#ProjectID) REFERENCES Project(ProjectID)

Which query returns the average salary of employees?

A) SELECT AVG(Salary) WHERE Employee;

B) SELECT MEAN(Salary) FROM Employee;

C) SELECT AVG(Salary) FROM Employee GROUP BY Salary;

D) SELECT AVG(Salary) FROM Employee;

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