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RX Pharmacy has conducted business analyses for its database project. The database specification includes the following business rules:
• For each drug, the trade name and formula must be recorded. Each drug is sold by a given pharmaceutical company, and the trade name identifies a drug uniquely from among the products of that company. If a pharmaceutical company is deleted, you need not to keep track of its product any longer
• 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 have to a start date, and 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. 1. Draw an ER diagram that captures the above information. Identify any constraints that are not captured in the ER diagram, if necessary. Since the information in the business rules is fairly detailed, you would need to incorporate the attributes (including primary and foreign keys) into the final ER diagram. 2. How would your design change if each drug must be sold at a fixed price by all pharmacies? 3. How would your design change if the design requirements change as follows: If a doctor prescribes the same drug for the same patient more than once, several such prescriptions may have to be stored. Please submit your diagram in VISIO or another computer assisted drawing application.
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