adding sql lab excercises for week 6
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Medium Fries
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116
cst363/lab/courses-ddl.sql
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116
cst363/lab/courses-ddl.sql
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create table classroom
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(building varchar(15),
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room_number varchar(7),
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capacity numeric(4,0),
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primary key (building, room_number)
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);
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create table department
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(dept_name varchar(20),
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building varchar(15),
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budget numeric(12,2) check (budget > 0),
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primary key (dept_name)
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);
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create table course
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(course_id varchar(8),
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title varchar(50),
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dept_name varchar(20),
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credits numeric(2,0) check (credits > 0),
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primary key (course_id),
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foreign key (dept_name) references department
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on delete set null
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);
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create table instructor
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(ID varchar(5),
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name varchar(20) not null,
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dept_name varchar(20),
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salary numeric(8,2) check (salary > 29000),
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primary key (ID),
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foreign key (dept_name) references department
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on delete set null
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);
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create table section
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(course_id varchar(8),
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sec_id varchar(8),
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semester varchar(6)
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check (semester in ('Fall', 'Winter', 'Spring', 'Summer')),
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year numeric(4,0) check (year > 1701 and year < 2100),
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building varchar(15),
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room_number varchar(7),
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time_slot_id varchar(4),
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primary key (course_id, sec_id, semester, year),
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foreign key (course_id) references course
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on delete cascade,
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foreign key (building, room_number) references classroom
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on delete set null
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);
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create table teaches
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(ID varchar(5),
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course_id varchar(8),
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sec_id varchar(8),
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semester varchar(6),
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year numeric(4,0),
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primary key (ID, course_id, sec_id, semester, year),
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foreign key (course_id,sec_id, semester, year) references section
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on delete cascade,
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foreign key (ID) references instructor
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on delete cascade
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);
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create table student
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(ID varchar(5),
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name varchar(20) not null,
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dept_name varchar(20),
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tot_cred numeric(3,0) check (tot_cred >= 0),
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primary key (ID),
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foreign key (dept_name) references department
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on delete set null
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);
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create table takes
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(ID varchar(5),
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course_id varchar(8),
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sec_id varchar(8),
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semester varchar(6),
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year numeric(4,0),
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grade varchar(2),
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primary key (ID, course_id, sec_id, semester, year),
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foreign key (course_id,sec_id, semester, year) references section
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on delete cascade,
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foreign key (ID) references student
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on delete cascade
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);
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create table advisor
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(s_ID varchar(5),
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i_ID varchar(5),
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primary key (s_ID),
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foreign key (i_ID) references instructor (ID)
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on delete set null,
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foreign key (s_ID) references student (ID)
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on delete cascade
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);
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create table time_slot
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(time_slot_id varchar(4),
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day varchar(1),
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start_hr numeric(2) check (start_hr >= 0 and start_hr < 24),
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start_min numeric(2) check (start_min >= 0 and start_min < 60),
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end_hr numeric(2) check (end_hr >= 0 and end_hr < 24),
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end_min numeric(2) check (end_min >= 0 and end_min < 60),
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primary key (time_slot_id, day, start_hr, start_min)
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);
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create table prereq
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(course_id varchar(8),
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prereq_id varchar(8),
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primary key (course_id, prereq_id),
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foreign key (course_id) references course
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on delete cascade,
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foreign key (prereq_id) references course
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);
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149
cst363/lab/courses-small.sql
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149
cst363/lab/courses-small.sql
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delete from prereq;
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delete from time_slot;
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delete from advisor;
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delete from takes;
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delete from student;
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delete from teaches;
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delete from section;
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delete from instructor;
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delete from course;
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delete from department;
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delete from classroom;
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insert into classroom values ('Packard', '101', '500');
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insert into classroom values ('Painter', '514', '10');
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insert into classroom values ('Taylor', '3128', '70');
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insert into classroom values ('Watson', '100', '30');
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insert into classroom values ('Watson', '120', '50');
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insert into department values ('Biology', 'Watson', '90000');
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insert into department values ('Comp. Sci.', 'Taylor', '100000');
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insert into department values ('Elec. Eng.', 'Taylor', '85000');
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insert into department values ('Finance', 'Painter', '120000');
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insert into department values ('History', 'Painter', '50000');
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insert into department values ('Music', 'Packard', '80000');
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insert into department values ('Physics', 'Watson', '70000');
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insert into course values ('BIO-101', 'Intro. to Biology', 'Biology', '4');
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insert into course values ('BIO-301', 'Genetics', 'Biology', '4');
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insert into course values ('BIO-399', 'Computational Biology', 'Biology', '3');
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insert into course values ('CS-101', 'Intro. to Computer Science', 'Comp. Sci.', '4');
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insert into course values ('CS-190', 'Game Design', 'Comp. Sci.', '4');
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insert into course values ('CS-315', 'Robotics', 'Comp. Sci.', '3');
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insert into course values ('CS-319', 'Image Processing', 'Comp. Sci.', '3');
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insert into course values ('CS-347', 'Database System Concepts', 'Comp. Sci.', '3');
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insert into course values ('EE-181', 'Intro. to Digital Systems', 'Elec. Eng.', '3');
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insert into course values ('FIN-201', 'Investment Banking', 'Finance', '3');
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insert into course values ('HIS-351', 'World History', 'History', '3');
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insert into course values ('MU-199', 'Music Video Production', 'Music', '3');
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insert into course values ('PHY-101', 'Physical Principles', 'Physics', '4');
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insert into instructor values ('10101', 'Srinivasan', 'Comp. Sci.', '65000');
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insert into instructor values ('12121', 'Wu', 'Finance', '90000');
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insert into instructor values ('15151', 'Mozart', 'Music', '40000');
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insert into instructor values ('22222', 'Einstein', 'Physics', '95000');
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insert into instructor values ('32343', 'El Said', 'History', '60000');
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insert into instructor values ('33456', 'Gold', 'Physics', '87000');
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insert into instructor values ('45565', 'Katz', 'Comp. Sci.', '75000');
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insert into instructor values ('58583', 'Califieri', 'History', '62000');
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insert into instructor values ('76543', 'Singh', 'Finance', '80000');
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insert into instructor values ('76766', 'Crick', 'Biology', '72000');
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insert into instructor values ('83821', 'Brandt', 'Comp. Sci.', '92000');
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insert into instructor values ('98345', 'Kim', 'Elec. Eng.', '80000');
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insert into section values ('BIO-101', '1', 'Summer', '2009', 'Painter', '514', 'B');
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insert into section values ('BIO-301', '1', 'Summer', '2010', 'Painter', '514', 'A');
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insert into section values ('CS-101', '1', 'Fall', '2009', 'Packard', '101', 'H');
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insert into section values ('CS-101', '1', 'Spring', '2010', 'Packard', '101', 'F');
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insert into section values ('CS-190', '1', 'Spring', '2009', 'Taylor', '3128', 'E');
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insert into section values ('CS-190', '2', 'Spring', '2009', 'Taylor', '3128', 'A');
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insert into section values ('CS-315', '1', 'Spring', '2010', 'Watson', '120', 'D');
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insert into section values ('CS-319', '1', 'Spring', '2010', 'Watson', '100', 'B');
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insert into section values ('CS-319', '2', 'Spring', '2010', 'Taylor', '3128', 'C');
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insert into section values ('CS-347', '1', 'Fall', '2009', 'Taylor', '3128', 'A');
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insert into section values ('EE-181', '1', 'Spring', '2009', 'Taylor', '3128', 'C');
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insert into section values ('FIN-201', '1', 'Spring', '2010', 'Packard', '101', 'B');
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insert into section values ('HIS-351', '1', 'Spring', '2010', 'Painter', '514', 'C');
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insert into section values ('MU-199', '1', 'Spring', '2010', 'Packard', '101', 'D');
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insert into section values ('PHY-101', '1', 'Fall', '2009', 'Watson', '100', 'A');
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insert into teaches values ('10101', 'CS-101', '1', 'Fall', '2009');
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insert into teaches values ('10101', 'CS-315', '1', 'Spring', '2010');
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insert into teaches values ('10101', 'CS-347', '1', 'Fall', '2009');
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insert into teaches values ('12121', 'FIN-201', '1', 'Spring', '2010');
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insert into teaches values ('15151', 'MU-199', '1', 'Spring', '2010');
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insert into teaches values ('22222', 'PHY-101', '1', 'Fall', '2009');
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insert into teaches values ('32343', 'HIS-351', '1', 'Spring', '2010');
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insert into teaches values ('45565', 'CS-101', '1', 'Spring', '2010');
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insert into teaches values ('45565', 'CS-319', '1', 'Spring', '2010');
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insert into teaches values ('76766', 'BIO-101', '1', 'Summer', '2009');
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insert into teaches values ('76766', 'BIO-301', '1', 'Summer', '2010');
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insert into teaches values ('83821', 'CS-190', '1', 'Spring', '2009');
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insert into teaches values ('83821', 'CS-190', '2', 'Spring', '2009');
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insert into teaches values ('83821', 'CS-319', '2', 'Spring', '2010');
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insert into teaches values ('98345', 'EE-181', '1', 'Spring', '2009');
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insert into student values ('00128', 'Zhang', 'Comp. Sci.', '102');
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insert into student values ('12345', 'Shankar', 'Comp. Sci.', '32');
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insert into student values ('19991', 'Brandt', 'History', '80');
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insert into student values ('23121', 'Chavez', 'Finance', '110');
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insert into student values ('44553', 'Peltier', 'Physics', '56');
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insert into student values ('45678', 'Levy', 'Physics', '46');
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insert into student values ('54321', 'Williams', 'Comp. Sci.', '54');
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insert into student values ('55739', 'Sanchez', 'Music', '38');
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insert into student values ('70557', 'Snow', 'Physics', '0');
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insert into student values ('76543', 'Brown', 'Comp. Sci.', '58');
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insert into student values ('76653', 'Aoi', 'Elec. Eng.', '60');
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insert into student values ('98765', 'Bourikas', 'Elec. Eng.', '98');
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insert into student values ('98988', 'Tanaka', 'Biology', '120');
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insert into takes values ('00128', 'CS-101', '1', 'Fall', '2009', 'A');
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insert into takes values ('00128', 'CS-347', '1', 'Fall', '2009', 'A-');
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insert into takes values ('12345', 'CS-101', '1', 'Fall', '2009', 'C');
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insert into takes values ('12345', 'CS-190', '2', 'Spring', '2009', 'A');
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insert into takes values ('12345', 'CS-315', '1', 'Spring', '2010', 'A');
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insert into takes values ('12345', 'CS-347', '1', 'Fall', '2009', 'A');
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insert into takes values ('19991', 'HIS-351', '1', 'Spring', '2010', 'B');
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insert into takes values ('23121', 'FIN-201', '1', 'Spring', '2010', 'C+');
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insert into takes values ('44553', 'PHY-101', '1', 'Fall', '2009', 'B-');
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insert into takes values ('45678', 'CS-101', '1', 'Fall', '2009', 'F');
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insert into takes values ('45678', 'CS-101', '1', 'Spring', '2010', 'B+');
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insert into takes values ('45678', 'CS-319', '1', 'Spring', '2010', 'B');
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insert into takes values ('54321', 'CS-101', '1', 'Fall', '2009', 'A-');
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insert into takes values ('54321', 'CS-190', '2', 'Spring', '2009', 'B+');
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insert into takes values ('55739', 'MU-199', '1', 'Spring', '2010', 'A-');
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insert into takes values ('76543', 'CS-101', '1', 'Fall', '2009', 'A');
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insert into takes values ('76543', 'CS-319', '2', 'Spring', '2010', 'A');
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insert into takes values ('76653', 'EE-181', '1', 'Spring', '2009', 'C');
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insert into takes values ('98765', 'CS-101', '1', 'Fall', '2009', 'C-');
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insert into takes values ('98765', 'CS-315', '1', 'Spring', '2010', 'B');
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insert into takes values ('98988', 'BIO-101', '1', 'Summer', '2009', 'A');
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insert into takes values ('98988', 'BIO-301', '1', 'Summer', '2010', null);
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insert into advisor values ('00128', '45565');
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insert into advisor values ('12345', '10101');
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insert into advisor values ('23121', '76543');
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insert into advisor values ('44553', '22222');
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insert into advisor values ('45678', '22222');
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insert into advisor values ('76543', '45565');
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insert into advisor values ('76653', '98345');
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insert into advisor values ('98765', '98345');
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insert into advisor values ('98988', '76766');
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insert into time_slot values ('A', 'M', '8', '0', '8', '50');
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insert into time_slot values ('A', 'W', '8', '0', '8', '50');
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insert into time_slot values ('A', 'F', '8', '0', '8', '50');
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insert into time_slot values ('B', 'M', '9', '0', '9', '50');
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insert into time_slot values ('B', 'W', '9', '0', '9', '50');
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insert into time_slot values ('B', 'F', '9', '0', '9', '50');
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insert into time_slot values ('C', 'M', '11', '0', '11', '50');
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insert into time_slot values ('C', 'W', '11', '0', '11', '50');
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insert into time_slot values ('C', 'F', '11', '0', '11', '50');
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insert into time_slot values ('D', 'M', '13', '0', '13', '50');
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insert into time_slot values ('D', 'W', '13', '0', '13', '50');
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insert into time_slot values ('D', 'F', '13', '0', '13', '50');
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insert into time_slot values ('E', 'T', '10', '30', '11', '45 ');
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insert into time_slot values ('E', 'R', '10', '30', '11', '45 ');
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insert into time_slot values ('F', 'T', '14', '30', '15', '45 ');
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insert into time_slot values ('F', 'R', '14', '30', '15', '45 ');
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insert into time_slot values ('G', 'M', '16', '0', '16', '50');
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insert into time_slot values ('G', 'W', '16', '0', '16', '50');
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insert into time_slot values ('G', 'F', '16', '0', '16', '50');
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insert into time_slot values ('H', 'W', '10', '0', '12', '30');
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insert into prereq values ('BIO-301', 'BIO-101');
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insert into prereq values ('BIO-399', 'BIO-101');
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insert into prereq values ('CS-190', 'CS-101');
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insert into prereq values ('CS-315', 'CS-101');
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insert into prereq values ('CS-319', 'CS-101');
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insert into prereq values ('CS-347', 'CS-101');
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insert into prereq values ('EE-181', 'PHY-101');
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cst363/lab/simple-joins-lab.pdf
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cst363/lab/simple-joins-lab.pdf
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cst363/lab/simple-joins.pdf
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### SELECT
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Used to select columns from some table.
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> Relational symbol: sigma
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> Relational symbol: pi
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### Projection
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Picks out the rows of a (set of) table(s)
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> Relational symbol: pi
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> Relational symbol: sigma
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### Union
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Adds the rows of two tables into some new table.
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Removes duplicates from resultant table as well.
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> `UNION table[table...]`
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> Relational symbol:
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> Relational symbol: U(looks like a U but w i d e)
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### Relational Algebra on paper
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18
cst363/lec/lec6.md
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cst363/lec/lec6.md
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# lec6
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## Lab activity
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This lecture features a lab activity in the lab/ directory named: `courses-ddl.sql` with instructions in `simple-joins-lab.pdf`.
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* Note: Just make sure to read int courses-ddl.sql first then courses-small.sql second otherwise there will be random errors.(I'm not taking responsibility for that garbage so don't flame me)
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## Natural Joins
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`Natural Joins`: allows us to join tables while getting rid of duplicate columns automatically.
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Form:
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```
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select columns_[...] from tableLeft natural join tableRight
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```
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While ther is no need to write extra `where` statements there is also the issue where there may be accidental matches since attributes are dropped.
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