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In: Computer Science

A hospital has a large number of registered physicians. Attributes of PHYSICIAN include Physician ID (the identifier) and Specialty.

Database Management Systems

Create an ER diagram based on the following rules:


  1. A hospital has a large number of registered physicians. Attributes of PHYSICIAN include Physician ID (the identifier) and Specialty. Patients are admitted to the hospital by physicians. Attributes of PATIENT include Patient ID (the identifier) and Patient Name. Any patient who is admitted must have exactly one admitting physician. A physician may optionally admit any number of patients. Once admitted, a given patient must be treated by at least one physician. A particular physician may treat any number of patients, or may not treat any patients. Whenever a patient is treated by a physician, the hospital wishes to record the details of the treatment (Treatment Detail). Components of Treatment Detail include Date, Time, and Results.

  2. Does your ERD allow for the same patient to be admitted by different physicians over time? How would you include on the ERD the need to represent the date on which a patient is admitted for each time he or she is admitted?

  3. Now modify the diagram to also include the equipment that is used by the physician during each treatment. For every treatment session the physician may use any number of equipment items and not every equipment item needs to be used. Equipment items are described by an identification number, a description and a last maintenance date.

  4. Each physician is qualified to used at least one equipment item and every item may have any number of physicians who are qualified to use it.  

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venereology answered 2 years ago
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