This is database system concept and using oracle.

1.Find the names and ids of the students who have taken at most one course(using unique) in the Spring 2010 semester.

2.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 );

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);