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Computer Engineering
Which of the following assertions captures the requirement that the total number of students enrolled in a course cannot be greater the course quota? (a) O create assertion check_quota check (not exists ( select * from Courses c join Enrolments e on (e.course = c.id) group by e.student having count (*) > c.quota ); (b) O create assertion check_quota check (not exists ( select * from (select c.id, count(student) as nstu, c.quota from Courses c join Enrolments e on (e.course = c.id) group by c.id, c.quota ) as x where x.nstu > x.quota ); (c) O create assertion check_quota check (not exists ( select * from Courses c where c.quota >= (select count(*) from Enrolments e where e.course = c.id) ); (d) O None of the above is correct

Which of the following assertions captures the requirement that the total number of students enrolled in a course cannot be greater the course quota? (a) O create assertion check_quota check (not exists ( select * from Courses c join Enrolments e on (e.course = c.id) group by e.student having count (*) > c.quota ); (b) O create assertion check_quota check (not exists ( select * from (select c.id, count(student) as nstu, c.quota from Courses c join Enrolments e on (e.course = c.id) group by c.id, c.quota ) as x where x.nstu > x.quota ); (c) O create assertion check_quota check (not exists ( select * from Courses c where c.quota >= (select count(*) from Enrolments e where e.course = c.id) ); (d) O None of the above is correct

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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Which of the following assertions captures the requirement that the total number of students enrolled in a course cannot be greater than the course quota? (a) O create assertion check_quota check (not exists ( select * from Courses c join Enrolments e on (e.course = c.id) group by e.student having count(*) > c.quota ); (b) O create assertion check_quota check (not exists ( select * from (select c.id, count(student) as nstu, c.quota from Courses c join Enrolments e on (e.course = c.id) group by c.id, c.quot ) as x where x.nstu > x.quota ); (c) O create assertion check_quota check (not exists ( select * from Courses c where c.quota >= (select count (*) from Enrolments e where e.course = c.id) ); (d) O None of the above is correct
Transcribed Image Text:Which of the following assertions captures the requirement that the total number of students enrolled in a course cannot be greater than the course quota? (a) O create assertion check_quota check (not exists ( select * from Courses c join Enrolments e on (e.course = c.id) group by e.student having count(*) > c.quota ); (b) O create assertion check_quota check (not exists ( select * from (select c.id, count(student) as nstu, c.quota from Courses c join Enrolments e on (e.course = c.id) group by c.id, c.quot ) as x where x.nstu > x.quota ); (c) O create assertion check_quota check (not exists ( select * from Courses c where c.quota >= (select count (*) from Enrolments e where e.course = c.id) ); (d) O None of the above is correct
Consider the following SQL schema: create table Courses ( id integer primary key, code text, title text, quota integer check (quota between 1 and 9999), ... ); create table Enrolments ( student integer references Students (id), course integer references Courses(id), ... );
Transcribed Image Text:Consider the following SQL schema: create table Courses ( id integer primary key, code text, title text, quota integer check (quota between 1 and 9999), ... ); create table Enrolments ( student integer references Students (id), course integer references Courses(id), ... );
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