EBK DATABASE SYSTEM CONCEPTS
7th Edition
ISBN: 9781260049268
Author: SILBERSCHATZ
Publisher: MCG COURSE
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Expert Solution & Answer
Chapter 4, Problem 5PE
a.
Explanation of Solution
Example of dataset
- Consider the case where a professor in physics department teaches an electric engineering course.
- Even though there is a valid entry in teaches, it is lost in the natural join of instructor, teaches and course, since the instructor’s department name does not match the department name of the course...
b.
Explanation of Solution
Reason for using query
- The query that computes the natural join of instructor, teaches and course is an example for creating tuples in reference relation ...
c.
Explanation of Solution
Reason for using query
- In the query,
select * from teaches natural join instructor;
- In the above query, some sections are lost if teaches...
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Chapter 4 Solutions
EBK DATABASE SYSTEM CONCEPTS
Ch. 4 - Prob. 1PECh. 4 - Prob. 2PECh. 4 - Prob. 3PECh. 4 - Prob. 4PECh. 4 - Prob. 5PECh. 4 - Prob. 6PECh. 4 - Prob. 7PECh. 4 - Prob. 8PECh. 4 - SQL allows a foreign-key dependency to refer to...Ch. 4 -
Given the relations a(name, address, title) and...
Ch. 4 - Prob. 11PECh. 4 - Prob. 12PECh. 4 - Prob. 13PECh. 4 - Prob. 14ECh. 4 - Prob. 15ECh. 4 - Prob. 16ECh. 4 - Prob. 17ECh. 4 - Prob. 18ECh. 4 - Prob. 19ECh. 4 - Show how to define a view tot_credits (year,...Ch. 4 - Prob. 21ECh. 4 - Prob. 22ECh. 4 - Prob. 23ECh. 4 - Prob. 24ECh. 4 - Prob. 25ECh. 4 - Prob. 26E
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