Consider a university database for the scheduling of classrooms for final exams. This database could be modeled as the single entity set exam, with attributes course-name, section-number, room-number, and time. Alternatively, one or more additional entity sets could be defined, along with relationship sets to replace some of the attributes of the exam entity set, as
• Course with attributes name, department, and c-number
• Section with attributes s-number and enrollment, and dependent as a weak entity set on course
• Room with attributes r-number, capacity, and building
a. Show an E-R diagram illustrating the use of all three additional entity sets listed.
b. Explain what application characteristics would influence a decision to include or not to include each of the additional entity sets

  • CreatedJanuary 28, 2011
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