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Computer Engineering
Consider the following relations: Students(snum: string, sname:string, major:string, level:string, age:int); Enrolled(snum: string, cname: string) And Consider the following query SELCT s.sname, s.age FROM Student s, Enrolled e WHERE s.snum = e.snum and s.level = 'JR' and e.cname = 'Database Management'; Given the following info: T(student) = 10000 records t(Enrolled) = 20000 record D(Student) = 300 pages B(enrolled) = 200 pages V(Student, level) = 5 // (FR, SP, SR, GRAD) V(Enrolled, cname) = 500 //there are 500 different courses) a. please draw a query plan for the above query: join two tables first, then apply selection finaally apply projection.       b. Please modify the query plan in (a) to apply push selection rule.

Consider the following relations: Students(snum: string, sname:string, major:string, level:string, age:int); Enrolled(snum: string, cname: string) And Consider the following query SELCT s.sname, s.age FROM Student s, Enrolled e WHERE s.snum = e.snum and s.level = 'JR' and e.cname = 'Database Management'; Given the following info: T(student) = 10000 records t(Enrolled) = 20000 record D(Student) = 300 pages B(enrolled) = 200 pages V(Student, level) = 5 // (FR, SP, SR, GRAD) V(Enrolled, cname) = 500 //there are 500 different courses) a. please draw a query plan for the above query: join two tables first, then apply selection finaally apply projection.       b. Please modify the query plan in (a) to apply push selection rule.

Computer Networking: A Top-Down Approach (7th Edition)
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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Consider the following relations:

Students(snum: string, sname:string, major:string, level:string, age:int);

Enrolled(snum: string, cname: string)

And Consider the following query

SELCT s.sname, s.age

FROM Student s, Enrolled e

WHERE s.snum = e.snum and s.level = 'JR' and e.cname = 'Database Management';

Given the following info:

T(student) = 10000 records

t(Enrolled) = 20000 record

D(Student) = 300 pages

B(enrolled) = 200 pages

V(Student, level) = 5 // (FR, SP, SR, GRAD)

V(Enrolled, cname) = 500 //there are 500 different courses)

a. please draw a query plan for the above query: join two tables first, then apply selection finaally apply projection.

 

 

 

b. Please modify the query plan in (a) to apply push selection rule.

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