DATABASE SYSTEM CONCEPTS (LOOSELEAF)
7th Edition
ISBN: 9781260515046
Author: SILBERSCHATZ
Publisher: MCG
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Chapter 16, Problem 9PE
Explanation of Solution
Explanation:
- The given expressions are,
- A,Bγagg(C)(E1 ⋈ E2)
- (Aγagg(C)(E1)) ⋈ E2
- The above two expressions are equivalent in the following situations,
- The relation E2 contains only the attributes A and B.
- In relation R2, there is no duplication as “A” is the primary key.
- The aggregate output for first expression will be different from the output of second expression if duplicates are allowed...
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Chapter 16 Solutions
DATABASE SYSTEM CONCEPTS (LOOSELEAF)
Ch. 16 - Prob. 2PECh. 16 - Prob. 3PECh. 16 - SQL allows relations with duplicates (Chapter 3),...Ch. 16 - Prob. 5PECh. 16 - Prob. 6PECh. 16 - Prob. 7PECh. 16 - Prob. 8PECh. 16 - Prob. 9PECh. 16 - Prob. 10PECh. 16 - Prob. 12PE
Ch. 16 - Prob. 13PECh. 16 - Prob. 14PECh. 16 - Prob. 16ECh. 16 - Prob. 17ECh. 16 - Prob. 19ECh. 16 - Explain how to use a histogram to estimate the...Ch. 16 - Prob. 21ECh. 16 - Prob. 22ECh. 16 - Describe how to incrementally maintain the results...Ch. 16 - Prob. 24ECh. 16 - Prob. 25ECh. 16 - Prob. 26ECh. 16 - Prob. 27E
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