Question: Explain the difference between physical and logical data
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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