Given the following query SELECT StudID, CourseTitle, Credits FROM Enrollment, Course WHERE Enrollment.CourseTitle = Course.CourseTitle AND Enrollment.Decision = TRUE and Course.Credits > 4 which of the following indexes could NOT be useful in speeding-up the query? a) tree-based index on Enrollment.CourseTitle b) hash-based index on Enrollment.Decision c) hash-based index on Course.CourseTitle d) hash-based index on Course.Credits   Can someone explain me step by step which is the correct answer and why,please?

Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
Section: Chapter Questions
Problem R1RQ: What is the difference between a host and an end system? List several different types of end...
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Given the following query


SELECT StudID, CourseTitle, Credits
FROM Enrollment, Course
WHERE Enrollment.CourseTitle = Course.CourseTitle AND
Enrollment.Decision = TRUE and Course.Credits > 4
which of the following indexes could NOT be useful in
speeding-up the query?

a) tree-based index on Enrollment.CourseTitle
b) hash-based index on Enrollment.Decision
c) hash-based index on Course.CourseTitle
d) hash-based index on Course.Credits

 

Can someone explain me step by step which is the correct answer and why,please? 

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