Explain the difference between physical and logical data independence.
Answer to relevant QuestionsExplain the distinctions among the terms primary key, candidate key, and superkey.Construct appropriate tables for each of the E-R diagrams in Exercises 2.2 to 2.4.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. ...Explain the distinction between disjoint and overlapping constraints.In Chapter we saw how to represent many-to-many, many-to-one, one-tomany, and one-to-one relationship sets. Explain how primary keys help us to represent such relationship sets in the relational model.
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