Answer the questions below each case study:

1. 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 (identifier), Name, and Phone No. Attributes of PROJECT include Project ID (identifier) and Start Date. Attributes of EQUIPMENT include Serial No and Cost. The organization wishes to record Assign Datethat is, the date when a given equipment item was assigned to a particular chemist working on a specified 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.

• Draw an ER diagram for the case study above. (If you believe that you need to make additional assumptions, clearly state them for each situation.)

2. A hospital has a large number of registered physicians. Attributes of PHYSICIAN include Physician ID (the identifier) and Specialty. Patients are admitted to the hospital by physicians. Attributes of PATIENT include Patient ID (the identifier) and Patient Name. Any patient who is admitted must have exactly one admitting physician. A physician may optionally admit any number of patients. Once admitted, a given patient must be treated by at least one physician. A particular physician may treat any number of patients, or may not treat any patients. Whenever a patient is treated by a physician, the hospital wishes to record the details of the treatment (Treatment Detail). Components of Treatment Detail include Date, Time, and Results.

• Draw an ER diagram for the case study above. (If you believe that you need to make additional assumptions, clearly state them for each situation.)
• Did you draw more than one relationship between physician and patient? Why or why not?
• Did you include hospital as an entity type? Why or why not?
• Does your ER diagram allow for the same patient to be admitted by different physicians over time?
• How would you include on the ER diagram the need to represent the date on which a patient is admitted for each time they are admitted?

To get full grades, you are required to comply following:
Complete (all parts of a question are addressed)	10
Correct	5
Submitted on time	5
Original	5
Total Grades = 25