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
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
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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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