Describe the various types of constraints on the, Ask an Expert

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Q1. Describe the various types of constraints on the Generalization or Specialization.

Q2. Composite and multi-valued attributes can be nested to any number of levels. Assume that we want to design an attribute for a STUDENT entity type to keep the track of previous college education. Such an attribute will encompass one entry for each college previously attended and this entry is composed of: college name, start and end dates, degree entries (degrees awarded at that college, if any) and transcript entries (courses completed at that college, if any). Each degree entry is formed of degree name and the month and year it was awarded and each transcript entry is made of a course name, semester, year and grade. Design the attribute to hold this information.

Q3. How the given ER constructs would be mapped to the relational model.

a) Aggregation.
b) Strong and weak entity set.
c) Generalization or Specialization.

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DBMS, Programming

Category:- DBMS
Reference No.:- M910933

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