Database System Concepts
7th Edition
ISBN: 9789332901384
Author: Henry F. Korth & S. Sudarshan Abraham Silberschatz
Publisher: MCGRAW-HILL HIGHER EDUCATION
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Expert Solution & Answer
Chapter 5, Problem 21E
Explanation of Solution
Modified recursive query:
The given recursive query has to be modified so that the depth attribute denotes the level of intermediate prerequisites which are between the course and the prerequisite.
The modified query is as follows:
with recursive prereq_depth(course_id, prereq_id, depth) as
(select course_id, prereq_id, 0
...
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Chapter 5 Solutions
Database System Concepts
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