Question
The Prescriptions-R-X chain of pharmacies has oered to give you a free lifetime supply of medicine if you design its database. Given the rising cost
The Prescriptions-R-X chain of pharmacies has oered to give you a free lifetime supply of medicine
if you design its database. Given the rising cost of health care, you agree. Here's the information that
you gather:
Patients are identied by an SSN, and their names, addresses, and ages must be recorded. Doctors
are identied by an SSN. For each doctor, the name, specialty, and years of experience must be
recorded. Each pharmaceutical company is identied by name and has a phone number. For each
drug, the trade name and formula must be recorded. Each drug is sold by a given pharmaceutical
company, and the trade name identies a drug uniquely from among the products of that company.
If a pharmaceutical company is deleted, you need not keep track of its products any longer. Each
pharmacy has a name, address, and phone number. Every patient has a primary physician. Every
doctor has at least one patient. Each pharmacy sells several drugs and has a price for each. A drug
could be sold at several pharmacies, and the price could vary from one pharmacy to another. Doctors
prescribe drugs for patients. A doctor could prescribe one or more drugs for several patients, and a
patient could obtain prescriptions from several doctors. Each prescription has a date and a quantity
associated with it. You can assume that, if a doctor prescribes the same drug for the same patient
more than once, only the last such prescription needs to be stored. Pharmaceutical companies have
long-term contracts with pharmacies. A pharmaceutical company can contract with several
pharmacies, and a pharmacy can contract with several pharmaceutical companies. For each contract,
you must store a start date, an end date, and the text of the contract. Pharmacies appoint a
supervisor for each contract. There must always be a supervisor for each contract, but the contract
supervisor can change over the lifetime of the contract.
Question
1. Draw an ER diagram that captures the preceding information.
Step by Step Solution
There are 3 Steps involved in it
Step: 1
Get Instant Access to Expert-Tailored Solutions
See step-by-step solutions with expert insights and AI powered tools for academic success
Step: 2
Step: 3
Ace Your Homework with AI
Get the answers you need in no time with our AI-driven, step-by-step assistance
Get Started