A company has a number of employees. The attributes of EMPLOY$-$

EE include Employee$\_$ID$($identifier$),$ Name, Address, and Birthdate.

The company alse has several projects. Attributes of PROJECT in$-$

clude Project$\_$ID$($identifier$),$ Project$\_$Name, and Start$\_$date. Each

employee may be assigned to one or more projects, or may not be

assigned to a project. A project must have at least one employee

assigned and may have any number of employees assigned. An em$-$

ployee's billing rate may vary by project, and the company wish$-$

es to record the applicable billing rate$($Billing$\_$Rate$)$ for each

employee when assigned to a particular project.