FIT328_DBS_Tutorial_04

FIT328_DBS_Tutorial_04 - DBS Tutorial Week 4 Exercise 1...

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DBS Tutorial Week 4 Exercise 1 Match the following terms and definitions: ___ supertype ___ entity cluster ___ subtype ___ specialization ___ subtype discriminator ___ attribute inheritance ___ overlap rule a. subset of supertype b. entity belongs to two subtypes c. subtype gets supertype attributes d. generalized entity type e. creating subtypes for an entity type f. a group of associated entity types and relationships g. locates target subtype for an entity Exercise 2 Examine the hierarchy for the university EER diagram:
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As a student, you are an instance of one of the subtypes: either UNDERGRAD STUDENT or GRADUATE STUDENT. List the names of all the attributes that apply to you. For each attribute, record the data value that applies to you. Exercise 3 Add a subtype discriminator for each of the supertypes shown in the figure above (Exercise 2). Show the discriminator values that assign instances to each subtype. Use the following subtype discriminator names and values: a. PERSON: Person Type (Employee? Alumnus? Student?) b.
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