(Homework Solution): using the above schema solve the following queries Find the IDs of all students who were taught by an instructor

classroom(building, room number, capacity) department dept-name, building, budget) courselcourse id, title, deptname, credits) instructor(ID, name, dept.name, salary) section(course id, sec id, semester, year, building, roomumber, time slotid) teaches(ID, course id, sec id, semester, year) student ID, name, dept name, tot cred) takes(ID, course.id, secid, semester year, grade) advisor(S-ID, İJD) time slot(time-slot.id, day, start time, endtime) prereq course id, prereqid)

using the above schema solve the following queries

Find the IDs of all students who were taught by an instructor named Einstein; make sure there are no duplicates in the result.

Find all instructors earning the highest salary (there may be more than one with the same salary).

Find the enrollment of each section that was offered in Fall 2009.

Find the maximum enrollment, across all sections, in Fall 2009.

Create a new course “CS-001”, titled “Weekly Seminar”, with 0 credits.

Expert Answer


1) select distinct take.id from instructor inst left join teaches teach on teach.ID = inst.ID left join takes take on take.course_id = teach.course_id and take.sec_id = teach.sec_id and take.semester = teach.semester and take.year = teach.year;

2) select name from instructor where salary = (select max(salary) from instructor);

3) select count(ID) as enrollment,course_id,sec_id from takes where semester = ‘Fall’ and

year = ‘2009’ group by course_id,sec_id;

4) select max(enrollment) max_enrollment,course_id,sec_id from (select count(ID) as enrollment,course_id,sec_id from takes where semester = ‘Fall’ and year = ‘2009’ group by course_id,sec_id);

5) insert into course(course_id,title,credits) values(‘CS-0001′,’Weekly Seminar’,0);

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