Solve the following question using oracle:sql

1 a. 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. Schema of the output should be (id, number_courses). Remember: derived relation means a subquery in the from clause. 1 b. 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). Using the pre-built database:

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

);

WITH TABLE INFORMATION BEING

delete from prereq; delete from time_slot; delete from advisor; delete from takes; delete from student; delete from teaches; delete from section; delete from instructor; delete from course; delete from department; delete from classroom; 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');