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•A company has a number of employees. The attributes of EMPLOYEE include Employee ID (identifier), Name, Address, and Birthdate. The company also has several projects. Attributes of PROJECT include 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 employee’s billing rate may vary by project, and the company wishes to record the applicable billing rate (Billing Rate) for each employee when assigned to a particular project.
 

Create an ER diagram for each of the following descriptions:

a)Students enrolled in courses.
b)Customers have many accounts.
c)An employee manages many projects.
d)A lecturer teaches many courses.
e)A department managed by a Head of Department.
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