DO NOT COPY FROM OTHER WEBSITES Upvote guarenteed for a correct and detailed answer. Thank you!!! c.quota);(b) Ocreate assertion check_quotacheck (not exists (select *from(select c.id,...

DO NOT COPY FROM OTHER WEBSITES

Upvote guarenteed for a correct and detailed answer. Thank you!!!

Extracted 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


Extracted 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), ... );