Homework Assignment #2 03/04/13 Please provide your answer after each problem and submit the file with your answers through Angel. Problem #8 from page 145 Using the Crow’s Foot methodology, create an ERD that can be implemented for a medical clinic, using at least the following business rules: a. A patient can make many appointments with one or more doctors in the clinic, and a doctor can accept appointments with many patients. However, each appointment is made with only one doctor and one patient. b. Emergency cases do not require an appointment.
However, for appointment management purposes, an emergency is entered in the appointment book as “unscheduled. ” c. If kept, an appointment yields a visit with the doctor specified in the appointment. The visit yields a diagnosis and, when appropriate, treatment. d. With each visit, the patient’s records are updated to provide a medical history e. Each patient visit creates a bill. Each patient visit is billed by one doctor, and each doctor can bill many patients. f. Each bill must be paid. However, a bill may be paid in many installments, and a payment may cover more than one bill. . A patient may pay the bill directly, or the bill may be the basis for a claim submitted to an insurance company. h. If the bill is paid by an insurance company, the deductible is submitted to the patient for payment. [pic] Problem #2 from page 173 Given the following business scenario, create a Crow’s Foot ERD using a specialization hierarchy if appropriate. Tiny Hospital keeps information on patients and hospital rooms. The system assigns each patient a patient ID number. In addition, the patient’s name and date of birth are recorded.
Some patients are resident patients (they spend at least one night in the hospital) and others are outpatients (they are treated and released). 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 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 believe specialization hierarchy is 100 percent not appropriate.
Although resident patients are an identi? able type of patient instance, there are not additional attributes that are unique to only that kind or type of patient. Participation in a relationship that is unique to a particular kind or type of instance is not suf? cient justi? cation for a specialization hierarchy. Indicating that only some instances will participate in a relationship is addressed by the optional participation designation. In this module, all resident patients must have a room; however, not all patients are resident patients so room is optional to patient.
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