Database System Concepts
Database System Concepts
7th Edition
ISBN: 9781260084504
Author: Abraham Silberschatz, S. Sudarshan, Abraham, Henry Korth, Silberschatz Abraham, Silberschatz Professor
Publisher: McGraw-Hill Education
Expert Solution & Answer
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Chapter 7, Problem 28E

Explanation of Solution

To Compute B+:

  • To compute B+, the closure of an attribute “B” over a set of functional dependencies “F”, refer the algorithm in Figure 7.19 of the textbook.
  • Consider the functional dependencies of Practice Exercises 7.6.
  • Execute the algorithm to compute B+ for these functional dependencies.
    • The result is initialized to {B}.
    • For the first repetition,
      • Refer the functional dependency ABC but here “A” is not a subset of {B}.
      • Refer the functional dependency CDE, but CD is not a subset of {B}

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