Assignment 2: 1. Modify the department number of an employee having fname as 'Joyce' to 5 2. Alter Table department add column DepartmentPhoneNum of NUMBER data type and insert values into this column only. 3. Alter table department to modify the size of DepartmentPhoneNum. 4. Modify the field name DepartmentPhoneNum of departments table to PhNo. 5. Rename Table Department as DEPT