Examine the data models that you created for Exercise D. How would the respective models change (if at all) on the basis of these corresponding new assumptions?
• Two patients have the same first and last names.
• Researchers can be associated with more than one institution.
• The store would like to keep track of purchased items.
• Many buyers have purchased multiple cars from Jim over time because he is such a good dealer.
Draw an entity relationship diagram (ERD) for the following situations:
1. Whenever new patients are seen for the first time, they complete a patient information form that asks their name, address, phone number, and insurance carrier, all of which are stored in the patient information file. Patients can be signed up with only one carrier, but they must be signed up to be seen by the doctor. Each time a patient visits the doctor, an insurance claim is sent to the carrier for payment. The claim must contain information about the visit, such as the date, purpose, and cost. It would be possible for a patient to submit two claims on the same day.
2. The state of Georgia is interested in designing a database that will track its researchers. Information of interest includes researcher name, title, position; university name, location, enrollment; and research interests. Each researcher is associated with only one institution, and each researcher has several research interests.
3. A department store has a bridal registry. This registry keeps information about the customer (usually the bride), the products that the store carries, and the products for which each customer registers. Customers typically register for a large number of products, and many customers register for the same products.
4. Jim Smith’s dealership sells Fords, Hondas, and Toyotas. The dealership keeps information about each car manufacturer with whom it deals so that employees can get in touch with manufacturers easily. The dealership also keeps information about the models of cars that it carries from each manufacturer. It keeps such information as list price, the price the dealership paid to obtain the model, and the model name and series (e.g., Honda Civic LX). The dealership also keeps information about all sales that it has made. (For instance, employees will record the buyer’s name, the car the buyer bought, and the amount the buyer paid for the car.) To allow employees to contact the buyers in the future, contact information is also kept (e.g., address, phone number, e-mail).