
Concept explainers
Consider the following two relations for Millennium College:
STUDENT(StudentID, StudentName,
CampusAddress, GPA)
REGISTRATION (StudentID, CourselD, Grade)
Following is a typical query against these relations:
SELECT Student_T.StudentID, StudentName,
CourselD, Grade
FROM Student_T, Registration_T
WHERE Student_T.StudentID =
Registration_T.StudentID
AND GPA >3.0
ORDER BY StudentName;
- On what attributes should indexes be defined to speed up this query? Give the reasons for each attribute selected.
- Write SQL commands to create indexes for each attribute you identified in part a.

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