This is database system concept and using oracle. Sorry, it is too long. 1.Find
ID: 3862415 • Letter: T
Question
This is database system concept and using oracle. Sorry, it is too long.
1.Find the names and ids of the students who have taken exactly one course in the Spring 2010 semester.
2.Find the names and ids of the students who have taken at most one course in the Spring 2010 semester.
3.Write a query that uses a derived relation to find the student(s) who have taken at least two courses in the Spring 2010 semester. Remember: derived relation means a subquery in the from clause.
4.Write a query that uses a scalar query in the select clause to find the number of distinct courses that have been taught by each instructor. Schema of the output should be (name, id, number_courses).
5.Use an outer join to find names of instructors who did not teach any course in the Spring 2010 semester.
6.Write a query that uses the with clause or a derived relation to find the id and number of courses that have been taken by student(s) who have taken the most number of courses.
create table classroom
(building varchar(15),
room_number varchar(7),
capacity numeric(4,0),
primary key (building, room_number)
);
create table department
(dept_name varchar(20),
building varchar(15),
budget numeric(12,2) check (budget > 0),
primary key (dept_name)
);
create table course
(course_id varchar(8),
title varchar(50),
dept_name varchar(20),
credits numeric(2,0) check (credits > 0),
primary key (course_id),
foreign key (dept_name) references department
on delete set null
);
create table instructor
(ID varchar(5),
name varchar(20) not null,
dept_name varchar(20),
salary numeric(8,2) check (salary > 29000),
primary key (ID),
foreign key (dept_name) references department
on delete set null
);
create table section
(course_id varchar(8),
sec_id varchar(8),
semester varchar(6)
check (semester in ('Fall', 'Winter', 'Spring', 'Summer')),
year numeric(4,0) check (year > 1701 and year< 2100),
building varchar(15),
room_number varchar(7),
time_slot_id varchar(4),
primary key (course_id, sec_id, semester, year),
foreign key (course_id) references course
on delete cascade,
foreign key (building, room_number) references classroom
on delete set null
);
create table teaches
(ID varchar(5),
course_id varchar(8),
sec_id varchar(8),
semester varchar(6),
year numeric(4,0),
primary key (ID, course_id, sec_id, semester, year),
foreign key (course_id,sec_id, semester, year) references section
on delete cascade,
foreign key (ID) references instructor
on delete cascade
);
create table student
(ID varchar(5),
name varchar(20) not null,
dept_name varchar(20),
tot_cred numeric(3,0) check (tot_cred >= 0),
primary key (ID),
foreign key (dept_name) references department
on delete set null
);
create table takes
(ID varchar(5),
course_id varchar(8),
sec_id varchar(8),
semester varchar(6),
year numeric(4,0),
grade varchar(2),
primary key (ID, course_id, sec_id, semester, year),
foreign key (course_id,sec_id, semester, year) references section
on delete cascade,
foreign key (ID) references student
on delete cascade
);
create table advisor
(s_ID varchar(5),
i_ID varchar(5),
primary key (s_ID),
foreign key (i_ID) references instructor (ID)
on delete set null,
foreign key (s_ID) references student (ID)
on delete cascade
);
create table time_slot
(time_slot_id varchar(4),
day varchar(1),
start_hr numeric(2) check (start_hr >= 0 and start_hr< 24),
start_min numeric(2) check (start_min >= 0 and start_min < 60),
end_hr numeric(2) check (end_hr >= 0 and end_hr< 24),
end_min numeric(2) check (end_min >= 0 and end_min< 60),
primary key (time_slot_id, day, start_hr, start_min)
);
create table prereq
(course_id varchar(8),
prereq_id varchar(8),
primary key (course_id, prereq_id),
foreign key (course_id) references course
on delete cascade,
foreign key (prereq_id) references course
);
insert into classroom values ('Packard', '101', '500');
insert into classroom values ('Painter', '514', '10');
insert into classroom values ('Taylor', '3128', '70');
insert into classroom values ('Watson', '100', '30');
insert into classroom values ('Watson', '120', '50');
insert into department values ('Biology', 'Watson', '90000');
insert into department values ('Comp. Sci.', 'Taylor', '100000');
insert into department values ('Elec. Eng.', 'Taylor', '85000');
insert into department values ('Finance', 'Painter', '120000');
insert into department values ('History', 'Painter', '50000');
insert into department values ('Music', 'Packard', '80000');
insert into department values ('Physics', 'Watson', '70000');
insert into course values ('BIO-101', 'Intro. to Biology', 'Biology', '4');
insert into course values ('BIO-301', 'Genetics', 'Biology', '4');
insert into course values ('BIO-399', 'Computational Biology', 'Biology', '3');
insert into course values ('CS-101', 'Intro. to Computer Science', 'Comp. Sci.', '4');
insert into course values ('CS-190', 'Game Design', 'Comp. Sci.', '4');
insert into course values ('CS-315', 'Robotics', 'Comp. Sci.', '3');
insert into course values ('CS-319', 'Image Processing', 'Comp. Sci.', '3');
insert into course values ('CS-347', 'Database System Concepts', 'Comp. Sci.', '3');
insert into course values ('EE-181', 'Intro. to Digital Systems', 'Elec. Eng.', '3');
insert into course values ('FIN-201', 'Investment Banking', 'Finance', '3');
insert into course values ('HIS-351', 'World History', 'History', '3');
insert into course values ('MU-199', 'Music Video Production', 'Music', '3');
insert into course values ('PHY-101', 'Physical Principles', 'Physics', '4');
insert into instructor values ('10101', 'Srinivasan', 'Comp. Sci.', '65000');
insert into instructor values ('12121', 'Wu', 'Finance', '90000');
insert into instructor values ('15151', 'Mozart', 'Music', '40000');
insert into instructor values ('22222', 'Einstein', 'Physics', '95000');
insert into instructor values ('32343', 'El Said', 'History', '60000');
insert into instructor values ('33456', 'Gold', 'Physics', '87000');
insert into instructor values ('45565', 'Katz', 'Comp. Sci.', '75000');
insert into instructor values ('58583', 'Califieri', 'History', '62000');
insert into instructor values ('76543', 'Singh', 'Finance', '80000');
insert into instructor values ('76766', 'Crick', 'Biology', '72000');
insert into instructor values ('83821', 'Brandt', 'Comp. Sci.', '92000');
insert into instructor values ('98345', 'Kim', 'Elec. Eng.', '80000');
insert into section values ('BIO-101', '1', 'Summer', '2009', 'Painter', '514', 'B');
insert into section values ('BIO-301', '1', 'Summer', '2010', 'Painter', '514', 'A');
insert into section values ('CS-101', '1', 'Fall', '2009', 'Packard', '101', 'H');
insert into section values ('CS-101', '1', 'Spring', '2010', 'Packard', '101', 'F');
insert into section values ('CS-190', '1', 'Spring', '2009', 'Taylor', '3128', 'E');
insert into section values ('CS-190', '2', 'Spring', '2009', 'Taylor', '3128', 'A');
insert into section values ('CS-315', '1', 'Spring', '2010', 'Watson', '120', 'D');
insert into section values ('CS-319', '1', 'Spring', '2010', 'Watson', '100', 'B');
insert into section values ('CS-319', '2', 'Spring', '2010', 'Taylor', '3128', 'C');
insert into section values ('CS-347', '1', 'Fall', '2009', 'Taylor', '3128', 'A');
insert into section values ('EE-181', '1', 'Spring', '2009', 'Taylor', '3128', 'C');
insert into section values ('FIN-201', '1', 'Spring', '2010', 'Packard', '101', 'B');
insert into section values ('HIS-351', '1', 'Spring', '2010', 'Painter', '514', 'C');
insert into section values ('MU-199', '1', 'Spring', '2010', 'Packard', '101', 'D');
insert into section values ('PHY-101', '1', 'Fall', '2009', 'Watson', '100', 'A');
insert into teaches values ('10101', 'CS-101', '1', 'Fall', '2009');
insert into teaches values ('10101', 'CS-315', '1', 'Spring', '2010');
insert into teaches values ('10101', 'CS-347', '1', 'Fall', '2009');
insert into teaches values ('12121', 'FIN-201', '1', 'Spring', '2010');
insert into teaches values ('15151', 'MU-199', '1', 'Spring', '2010');
insert into teaches values ('22222', 'PHY-101', '1', 'Fall', '2009');
insert into teaches values ('32343', 'HIS-351', '1', 'Spring', '2010');
insert into teaches values ('45565', 'CS-101', '1', 'Spring', '2010');
insert into teaches values ('45565', 'CS-319', '1', 'Spring', '2010');
insert into teaches values ('76766', 'BIO-101', '1', 'Summer', '2009');
insert into teaches values ('76766', 'BIO-301', '1', 'Summer', '2010');
insert into teaches values ('83821', 'CS-190', '1', 'Spring', '2009');
insert into teaches values ('83821', 'CS-190', '2', 'Spring', '2009');
insert into teaches values ('83821', 'CS-319', '2', 'Spring', '2010');
insert into teaches values ('98345', 'EE-181', '1', 'Spring', '2009');
insert into student values ('00128', 'Zhang', 'Comp. Sci.', '102');
insert into student values ('12345', 'Shankar', 'Comp. Sci.', '32');
insert into student values ('19991', 'Brandt', 'History', '80');
insert into student values ('23121', 'Chavez', 'Finance', '110');
insert into student values ('44553', 'Peltier', 'Physics', '56');
insert into student values ('45678', 'Levy', 'Physics', '46');
insert into student values ('54321', 'Williams', 'Comp. Sci.', '54');
insert into student values ('55739', 'Sanchez', 'Music', '38');
insert into student values ('70557', 'Snow', 'Physics', '0');
insert into student values ('76543', 'Brown', 'Comp. Sci.', '58');
insert into student values ('76653', 'Aoi', 'Elec. Eng.', '60');
insert into student values ('98765', 'Bourikas', 'Elec. Eng.', '98');
insert into student values ('98988', 'Tanaka', 'Biology', '120');
insert into takes values ('00128', 'CS-101', '1', 'Fall', '2009', 'A');
insert into takes values ('00128', 'CS-347', '1', 'Fall', '2009', 'A-');
insert into takes values ('12345', 'CS-101', '1', 'Fall', '2009', 'C');
insert into takes values ('12345', 'CS-190', '2', 'Spring', '2009', 'A');
insert into takes values ('12345', 'CS-315', '1', 'Spring', '2010', 'A');
insert into takes values ('12345', 'CS-347', '1', 'Fall', '2009', 'A');
insert into takes values ('19991', 'HIS-351', '1', 'Spring', '2010', 'B');
insert into takes values ('23121', 'FIN-201', '1', 'Spring', '2010', 'C+');
insert into takes values ('44553', 'PHY-101', '1', 'Fall', '2009', 'B-');
insert into takes values ('45678', 'CS-101', '1', 'Fall', '2009', 'F');
insert into takes values ('45678', 'CS-101', '1', 'Spring', '2010', 'B+');
insert into takes values ('45678', 'CS-319', '1', 'Spring', '2010', 'B');
insert into takes values ('54321', 'CS-101', '1', 'Fall', '2009', 'A-');
insert into takes values ('54321', 'CS-190', '2', 'Spring', '2009', 'B+');
insert into takes values ('55739', 'MU-199', '1', 'Spring', '2010', 'A-');
insert into takes values ('76543', 'CS-101', '1', 'Fall', '2009', 'A');
insert into takes values ('76543', 'CS-319', '2', 'Spring', '2010', 'A');
insert into takes values ('76653', 'EE-181', '1', 'Spring', '2009', 'C');
insert into takes values ('98765', 'CS-101', '1', 'Fall', '2009', 'C-');
insert into takes values ('98765', 'CS-315', '1', 'Spring', '2010', 'B');
insert into takes values ('98988', 'BIO-101', '1', 'Summer', '2009', 'A');
insert into takes values ('98988', 'BIO-301', '1', 'Summer', '2010', null);
insert into advisor values ('00128', '45565');
insert into advisor values ('12345', '10101');
insert into advisor values ('23121', '76543');
insert into advisor values ('44553', '22222');
insert into advisor values ('45678', '22222');
insert into advisor values ('76543', '45565');
insert into advisor values ('76653', '98345');
insert into advisor values ('98765', '98345');
insert into advisor values ('98988', '76766');
insert into time_slot values ('A', 'M', '8', '0', '8', '50');
insert into time_slot values ('A', 'W', '8', '0', '8', '50');
insert into time_slot values ('A', 'F', '8', '0', '8', '50');
insert into time_slot values ('B', 'M', '9', '0', '9', '50');
insert into time_slot values ('B', 'W', '9', '0', '9', '50');
insert into time_slot values ('B', 'F', '9', '0', '9', '50');
insert into time_slot values ('C', 'M', '11', '0', '11', '50');
insert into time_slot values ('C', 'W', '11', '0', '11', '50');
insert into time_slot values ('C', 'F', '11', '0', '11', '50');
insert into time_slot values ('D', 'M', '13', '0', '13', '50');
insert into time_slot values ('D', 'W', '13', '0', '13', '50');
insert into time_slot values ('D', 'F', '13', '0', '13', '50');
insert into time_slot values ('E', 'T', '10', '30', '11', '45 ');
insert into time_slot values ('E', 'R', '10', '30', '11', '45 ');
insert into time_slot values ('F', 'T', '14', '30', '15', '45 ');
insert into time_slot values ('F', 'R', '14', '30', '15', '45 ');
insert into time_slot values ('G', 'M', '16', '0', '16', '50');
insert into time_slot values ('G', 'W', '16', '0', '16', '50');
insert into time_slot values ('G', 'F', '16', '0', '16', '50');
insert into time_slot values ('H', 'W', '10', '0', '12', '30');
insert into prereq values ('BIO-301', 'BIO-101');
insert into prereq values ('BIO-399', 'BIO-101');
insert into prereq values ('CS-190', 'CS-101');
insert into prereq values ('CS-315', 'CS-101');
insert into prereq values ('CS-319', 'CS-101');
insert into prereq values ('CS-347', 'CS-101');
insert into prereq values ('EE-181', 'PHY-101');
Explanation / Answer
1.Find the names and ids of the students who have taken exactly one course in the Spring 2010 semester.
select name, id from student where id in(select id from takes where semester='Spring' and year=2010 group by id having count(id)=1)
NAME ID
Shankar 12345
Brandt 19991
Chavez 23121
Sanchez 55739
Brown 76543
Bourikas 98765
2.Find the names and ids of the students who have taken at most one course in the Spring 2010 semester.
select s.name, s.id from student s left join (select t.id, count(t.id) as count from takes t where t.semester='Spring' and t.year=2010 group by t.id) take on s.id = take.id where NVL(take.count,0) <= 1
NAME ID
Chavez 23121
Bourikas 98765
Shankar 12345
Brandt 19991
Brown 76543
Levy 45678
Sanchez 55739
Tanaka 98988
Aoi 76653
Zhang 00128
Peltier 44553
Snow 70557
Williams 54321
3.Write a query that uses a derived relation to find the student(s) who have taken at least two courses in the Spring 2010 semester. Remember: derived relation means a subquery in the from clause.
select id, name from (select s.id, s.name from student s right join takes t on s.id=t.id where t.semester='Spring' and t.year=2010 group by t.id,s.id, s.name having count(t.id)>=2)
ID NAME
45678 Levy
4.Write a query that uses a scalar query in the select clause to find the number of distinct courses that have been taught by each instructor. Schema of the output should be (name, id, number_courses).
select i.name, i.id, (select count(t.course_id) from teaches t where t.id=i.id group by t.id) number_courses from instructor i
NAME ID NUMBER_COURSES
Srinivasan 10101 3
Wu 12121 1
Mozart 15151 1
Einstein 22222 1
El Said 32343 1
Gold 33456 -
Katz 45565 2
Califieri 58583 -
Singh 76543 -
Crick 76766 2
Brandt 83821 3
Kim 98345 1
Sorry.. due to time constaints, i am not able to answer all your queries but only first 4. Request you to please post the other queries in a separate question.
Thanks,
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