Draw ERD for each of the following situation and submit your drawings (hand-drawing, Visio etc. are all accepted) in Word format with your name on the document:
A company has a number of employees. The attributes of EMPLOYEE include Employee ID, Name, Address, and Birthdate. The company also has several projects. Attributes of PROJECT include Project ID, 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 for each employee when assigned to a particular project.
A laboratory has several chemists who work on one or more projects. Chemists also may use certain kinds of equipment on each project.
Attributes of CHEMIST include Employee ID, Name, and Phone No. Attributes of PROJECT include project ID, and start date. Attributes of
EQUIPMENT include serial number and cost. The organization wishes to record assign date - the date when a given equipment item was assigned to a particular chemist working on a specific project. A chemist must be assigned to at least one project and one equipment item.
A given equipment item need not be assigned, and a given project need not be assigned either a chemist or an equipment item.