adding sql lab excercises for week 6

cst363/lab/courses-ddl.sql

@@ -0,0 +1,116 @@
+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
+	);
+

cst363/lab/courses-small.sql

@@ -0,0 +1,149 @@
+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');

cst363/lec/lec3.md

@@ -5,20 +5,18 @@
 ### SELECT
 Used to select columns from some table.
 
-> Relational symbol: sigma
+> Relational symbol: pi
 
 ### Projection
 Picks out the rows of a (set of) table(s)
 
-> Relational symbol: pi
+> Relational symbol: sigma
 
 ### Union
 Adds the rows of two tables into some new table. 
 Removes duplicates from resultant table as well.
 
-> `UNION table[table...]`
+> Relational symbol: U(looks like a U but w i d e) 
-
-> Relational symbol: 
 
 ### Relational Algebra on paper
 

cst363/lec/lec6.md

@@ -0,0 +1,18 @@
+# lec6
+
+## Lab activity
+
+This lecture features a lab activity in the lab/ directory named: `courses-ddl.sql` with instructions in `simple-joins-lab.pdf`.
+
+* 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)
+
+## Natural Joins
+
+`Natural Joins`: allows us to join tables while getting rid of duplicate columns automatically.
+
+Form:
+
+```
+select columns_[...] from tableLeft natural join tableRight
+```
+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.