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Consider the following relations. • Student (zno, sname, age) · Enroll (zno, cno) • Course (cno, cname, semester) Given the following SQL, which one is the best index to improve the query performance. SELECT S.zno, S.sname, count(cno) FROM Student S, Enroll E WHERE S.zno = E.zno GROUP BY S.zno HAVING count(cno) >10;

Consider the following relations. • Student (zno, sname, age) · Enroll (zno, cno) • Course (cno, cname, semester) Given the following SQL, which one is the best index to improve the query performance. SELECT S.zno, S.sname, count(cno) FROM Student S, Enroll E WHERE S.zno = E.zno GROUP BY S.zno HAVING count(cno) >10;

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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Consider the following relations. • Student (zno, sname, age) • Enroll (zno, cno) • Course (cno, cname, semester) Given the following SQL, which one is the best index to improve the query performance. SELECT S.zno, S.sname, count(cno) FROM Student S, Enroll E WHERE S.zno = E.zno GROUP BY S.zno HAVING count(cno) >10; O None of the above O Hash Index for Course (cno) O Hash Index for Student (zno) B+ index for Enroll (cno,zno) O B+ index for Enroll (zno,cno)
Transcribed Image Text:Consider the following relations. • Student (zno, sname, age) • Enroll (zno, cno) • Course (cno, cname, semester) Given the following SQL, which one is the best index to improve the query performance. SELECT S.zno, S.sname, count(cno) FROM Student S, Enroll E WHERE S.zno = E.zno GROUP BY S.zno HAVING count(cno) >10; O None of the above O Hash Index for Course (cno) O Hash Index for Student (zno) B+ index for Enroll (cno,zno) O B+ index for Enroll (zno,cno)
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