DATABASE SYSTEM CONCEPTS (LOOSELEAF)
7th Edition
ISBN: 9781260515046
Author: SILBERSCHATZ
Publisher: MCG
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Expert Solution & Answer
Chapter 7, Problem 2PE
Explanation of Solution
Identifying the Non-trivial functional dependencies:
The given figure 7.18 depicts 3 relations.
Considering the attributes A and B,
For each value of the A there is only one value for B and it is indicated as shown below:
Considering the attributes B and C,
For one value of B there are multiple values present for C and it is not considered to be non-trivial functional dependency between them.
Similarly by considering the possible combinations of the relation the following non trivial functional dependencies can be obtained and it is shown below:
Using the above two dependencies identified, third is obtained using the union axiom and it can be logically indicat
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# Find the error# Why will the following code not print out a list of contact namesphoneBook = {'Doe, Jane' : '843-000-0000' ,'Doe, John' : '843-111-1111' ,'Smith, Adam' : '843-222-2222' ,'Jobs, Steve' : '999-333-3333' ,}for contact in phoneBook.values():print(contact)
# Find the error:# The following code creates an empty dictionary and attempts to add a record# Why will the following code not create a new dictionary entry as intended?phoneBook = {}phoneBook{'Jobs, Steve'} = '999-111-1111'
Chapter 7 Solutions
DATABASE SYSTEM CONCEPTS (LOOSELEAF)
Ch. 7 - Prob. 1PECh. 7 - Prob. 2PECh. 7 - Explain how functional dependencies can be used to...Ch. 7 - Prob. 4PECh. 7 - Prob. 5PECh. 7 - Prob. 6PECh. 7 - Prob. 7PECh. 7 - Prob. 8PECh. 7 - Prob. 9PECh. 7 - Prob. 10PE
Ch. 7 - Prob. 11PECh. 7 - Prob. 12PECh. 7 - Prob. 13PECh. 7 - Prob. 14PECh. 7 - Prob. 15PECh. 7 - Prob. 16PECh. 7 - Prob. 17PECh. 7 - Prob. 18PECh. 7 - Prob. 19PECh. 7 - Prob. 20PECh. 7 - Prob. 21ECh. 7 - Prob. 22ECh. 7 -
Explain what is meant by repetition of...Ch. 7 -
Why are certain functional dependencies called...Ch. 7 - Prob. 25ECh. 7 - Prob. 26ECh. 7 - Prob. 27ECh. 7 - Prob. 28ECh. 7 - Prob. 29ECh. 7 - Prob. 30ECh. 7 - Prob. 32ECh. 7 - Prob. 33ECh. 7 - Prob. 35ECh. 7 - Prob. 36ECh. 7 - Prob. 37ECh. 7 - Prob. 38ECh. 7 - Prob. 39ECh. 7 - Prob. 40ECh. 7 - Prob. 41ECh. 7 - Prob. 42ECh. 7 - Prob. 43E
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