DBMS-GATE | Question 6

Consider the following tables:
Employees:

1. EmployeeID (Primary Key)
2. FirstName
3. LastName
4. DepartmentID (Foreign Key referencing Departments.DepartmentID)
5. Salary

Departments:

1. DepartmentID (Primary Key)
2. DepartmentName
You need to enforce the following integrity constraints:

I. An employee must belong to a valid department.
II. The salary of an employee must be greater than 30000.

(A)

ALTER TABLE Employees
ADD CONSTRAINT FK_Department
FOREIGN KEY (DepartmentID)
REFERENCES Employees(DepartmentID);

ALTER TABLE Employees
ADD CONSTRAINT CHK_Salary
CHECK (Salary > 30000);

(B)

ALTER TABLE Employees
ADD CONSTRAINT CHK_Salary
FOREIGN KEY (EmployeeID)
CHECK salary > 30000;

ALTER TABLE Employees
ADD CONSTRAINT FK_Department
REFERENCES Departments(DepartmentID);

(C)

ALTER TABLE Employees
ADD CONSTRAINT fk_department
FOREIGN KEY (DepartmentID)
REFERENCES Departments(DepartmentID);

ALTER TABLE Employees
ADD CONSTRAINT chk_salary
CHECK (Salary > 30000);

(D)

ALTER TABLE Employees
ADD CONSTRAINT CHK_Salary
CHECK (Salary > = 30000);

ALTER TABLE Employees
ADD CONSTRAINT FK_Department
FOREIGN KEY (DepartmentID)
REFERENCES Departments(DepartmentID);

Answer

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