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Engineering
Computer Science
with recursive rec_prereq(course_id, prereq_id) as ( select course_id, prereq_id from prereq union select rec_prereq.course_id, prereq.prereq_id from rec-prereq, prereq where rec-prereq.prereq_id = prereq.course_id select * from rec-prereq; Figure 5.16 Recursive query in SQL.

with recursive rec_prereq(course_id, prereq_id) as ( select course_id, prereq_id from prereq union select rec_prereq.course_id, prereq.prereq_id from rec-prereq, prereq where rec-prereq.prereq_id = prereq.course_id select * from rec-prereq; Figure 5.16 Recursive query in SQL.

Database System Concepts
Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
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Modify the recursive query in Figure 5.16 to define a relation
prereq_depth(course_id, prereq_id, depth) where the attribute depth indicates how many levels of intermediate prerequisites there are between the course and the prerequisite. Direct prerequisites have
a depth of 0. Note that a prerequisite course may have multiple depths and thus
may appear more than once.

with recursive rec_prereq(course_id, prereq_id) as ( select course_id, prereq_id from prereq union select rec_prereq.course_id, prereq.prereq_id from rec-prereq, prereq where rec-prereq.prereq_id = prereq.course_id select * from rec-prereq; Figure 5.16 Recursive query in SQL.
Transcribed Image Text:with recursive rec_prereq(course_id, prereq_id) as ( select course_id, prereq_id from prereq union select rec_prereq.course_id, prereq.prereq_id from rec-prereq, prereq where rec-prereq.prereq_id = prereq.course_id select * from rec-prereq; Figure 5.16 Recursive query in SQL.
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