Question

Tiny Hospital keeps information on patients and hospital rooms. The system assigns each patient a patient ID number. In addition, the patient’s last name, first name, date of birth, and date of admission are recorded. Also, every patient is seen by a Physician who develops a treatment plan for the patient. Each Physician may see many patients. Some patients are resident patients (they spend at least one night in the hospital) and others are outpatients (they are treated and released). A Check back date is recorded for all out patients, and a Date of discharge is recorded for all resident patients. Resident patients are assigned to a room. Each room is identified by a room number.   The system also stores the room type (private or semiprivate), and room fee. Over time, each room will have many resident patients that stay in it. Each resident patient will stay in only one room. Every room must have had a patient, and every resident patient must have a room.

(i) Given the following business scenario (next page), create a Crow’s Foot Extended Entity Relationship Diagram (EERD) using a specialization hierarchy that identifies all the following constraints.

a) Subtype discriminator

b) Disjoint or overlapping subtypes

c) Partial or total completeness

(ii) Transform the EER model developed in a relational schema.

Show all relations and identify appropriate entity and referential integrity constraints

Answer 1

Find below crow's EERD diagram for tiny hospital.The extended EERD diagram can be as given below for tiny hospitalThe diagram represents the subtype is of disjoint typeconstraint where the patient can be either outpatient or resident patient but cannot be both at a given instance of time the letter d in diagram represents to it