Database System Concepts
7th Edition
ISBN: 9780078022159
Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher: McGraw-Hill Education
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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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