Scneario is :A company has a number of employee . The attribute of empoyee include, Emp_id , Name , Address , Birthdate. The company also have several projects . The attribute of project are: Proj_id , Name and start date. Each employ may be assigned to one or more projects or may be assigned to a project.A projec must have at least one Employee assigned and may have any number of employee assigned. An employee"s billing rate may vary by project and company . Wishes to record . The applicable billing rate ( billing_rate) for each employee when assigned to a particular project.