Assignment 1 - DB - Vinh Nhan

.vscode/settings.json

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+{
+  "workbench.colorCustomizations": {
+    "activityBar.background": "#223213",
+    "titleBar.activeBackground": "#30461B",
+    "titleBar.activeForeground": "#F7FBF4"
+  }
+}

capital-gain-loss.sql

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+SELECT stock_name, 
+SUM(
+    CASE
+    WHEN operation = 'Sell' THEN price
+    WHEN operation = 'Buy' THEN -price
+    END
+) AS capital_gain_loss
+FROM stocks
+GROUP BY stock_name

count-salary-categories.sql

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+SELECT
+'High Salary' AS category,
+SUM(CASE WHEN income>50000 THEN 1 ELSE 0 END) AS accounts_count
+FROM 
+accounts
+
+UNION
+
+SELECT
+'Low Salary' AS category,
+SUM(CASE WHEN income<20000 THEN 1 ELSE 0 END)   AS accounts_count
+FROM 
+accounts
+
+UNION
+
+SELECT
+'Average Salary' AS category,
+SUM(CASE WHEN (income>=20000 AND income<=50000) THEN 1 ELSE 0 END)  AS accounts_count
+FROM 
+accounts

mysql-docker/db/create-db.sql

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+
+CREATE TABLE IF NOT EXISTS Professor (
+	prof_id INT PRIMARY KEY NOT NULL AUTO_INCREMENT,
+    prof_lname VARCHAR(50),
+    prof_fname VARCHAR(50)
+);
+CREATE TABLE IF NOT EXISTS Student (
+	stud_id INT PRIMARY KEY NOT NULL AUTO_INCREMENT,
+    stud_fname VARCHAR(50) NOT NULL, 
+    stud_lname VARCHAR(50) NOT NULL,
+    stud_street VARCHAR(255), 
+    stud_city VARCHAR(50), 
+    stud_zip VARCHAR(10)
+);
+CREATE TABLE IF NOT EXISTS Course (
+	course_id INT PRIMARY KEY NOT NULL AUTO_INCREMENT,
+	course_name VARCHAR(255) NOT NULL
+);
+CREATE TABLE IF NOT EXISTS Room(
+	room_id INT PRIMARY KEY NOT NULL AUTO_INCREMENT,
+    room_loc VARCHAR(50) NOT NULL,
+    room_cap VARCHAR(50) NOT NULL,
+    class_id INT NULL
+);
+CREATE TABLE IF NOT EXISTS Class (
+	class_id INT PRIMARY KEY NOT NULL AUTO_INCREMENT,
+    class_name VARCHAR(255) NOT NULL,
+    prof_id INT NOT NULL, 
+    course_id INT NOT NULL,
+    room_id INT NOT NULL-- add constraint later
+);
+CREATE TABLE IF NOT EXISTS Enroll(
+	stud_id INT NOT NULL,
+    class_id INT NOT NULL,
+    grade VARCHAR(3) NOT NULL,
+    PRIMARY KEY (stud_id, class_id)
+);
+-- Add constraint to Class table
+ALTER TABLE Class ADD CONSTRAINT fk_class_professor_prof_id
+FOREIGN KEY (prof_id) REFERENCES Professor (prof_id);
+
+ALTER TABLE Class ADD CONSTRAINT fk_class_course_course_id
+FOREIGN KEY (course_id) REFERENCES Course (course_id);
+
+ALTER TABLE Class ADD CONSTRAINT fk_class_room_room_id
+FOREIGN KEY (room_id) REFERENCES Room (room_id);
+-- end
+
+
+-- add constraint to Enroll table
+ALTER TABLE Enroll ADD CONSTRAINT fk_enroll_student_stud_id
+FOREIGN KEY (stud_id) REFERENCES Student (stud_id);
+
+ALTER TABLE Enroll ADD CONSTRAINT fk_enroll_class_class_id
+FOREIGN KEY (class_id) REFERENCES Class (class_id);
+-- end
+
+-- add constraint to Room table
+ALTER TABLE Room ADD CONSTRAINT fk_room_class_class_id
+FOREIGN KEY (class_id) REFERENCES Class (class_id);
+-- end
+
+-- INSERT 
+INSERT INTO Professor (prof_lname, prof_fname)
+VALUES
+	('Smith', 'John'),
+	('Johnson', 'Emily'),
+	('Brown', 'Michael'),
+	('Davis', 'Sarah'),
+	('Miller', 'David'),
+	('Wilson', 'Jennifer'),
+	('Anderson', 'Christopher'),
+	('Thomas', 'Jessica'),
+	('Taylor', 'Matthew'),
+	('Moore', 'Amanda');
+
+INSERT INTO Student (stud_fname, stud_lname, stud_street, stud_city, stud_zip) 
+VALUES
+	('Emma', 'Johnson', '123 Main St', 'New York', '10001'),
+	('Oliver', 'Williams', '456 Elm St', 'Los Angeles', '90001'),
+	('Sophia', 'Jones', '789 Oak St', 'Chicago', '60601'),
+	('Liam', 'Brown', '234 Maple St', 'Houston', '77001'),
+	('Ava', 'Davis', '567 Pine St', 'Philadelphia', '19101'),
+	('Noah', 'Wilson', '890 Cedar St', 'Phoenix', '85001'),
+	('Isabella', 'Lee', '321 Birch St', 'San Antonio', '78201'),
+	('Mason', 'Taylor', '654 Willow St', 'San Diego', '92101'),
+	('Charlotte', 'Clark', '987 Spruce St', 'Dallas', '75201'),
+	('Elijah', 'Moore', '654 Rose St', 'Austin', '78701');
+
+INSERT INTO Course (course_name) 
+VALUES
+	('Mathematics'),
+	('English'),
+	('History'),
+	('Science'),
+	('Art'),
+	('Computer Science'),
+	('Physics'),
+	('Biology'),
+	('Chemistry'),
+	('Music');
+
+-- set class id null than update later on
+INSERT INTO Room (room_loc, room_cap, class_id) 
+VALUE
+	('Building A, Room 101', '30',NULL),
+	('Building A, Room 102', '25',NULL),
+	('Building B, Room 201', '40',NULL),
+	('Building B, Room 202', '35',NULL),
+	('Building C, Room 301', '20',NULL),
+	('Building C, Room 302', '15',NULL),
+	('Building D, Room 401', '30',NULL),
+	('Building D, Room 402', '25',NULL),
+	('Building E, Room 501', '40',NULL),
+	('Building E, Room 502', '35',NULL);
+
+INSERT INTO Class (class_name, prof_id, course_id, room_id) 
+VALUES
+	('Class 1', 1, 1, 1),
+	('Class 2', 2, 2, 2),
+	('Class 3', 3, 3, 3),
+	('Class 4', 4, 4, 4),
+	('Class 5', 5, 5, 5),
+	('Class 6', 6, 6, 6),
+	('Class 7', 7, 7, 7),
+	('Class 8', 8, 8, 8),
+	('Class 9', 9, 9, 9),
+	('Class 10',10,10,10);
+
+INSERT INTO Enroll (stud_id, class_id, grade) 
+VALUES
+	(1, 1, 'A'),
+	(2, 2, 'B'),
+	(3, 3, 'C'),
+	(4, 4, 'A'),
+	(5, 5, 'B'),
+	(6, 6, 'C'),
+	(7, 7, 'A'),
+	(8, 8, 'B'),
+	(9, 9, 'C'),
+	(10, 10, 'A');

mysql-docker/docker-compose.yml

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+version: "3.8"
+services:
+  db:
+    image: mysql:8.0
+    cap_add:
+      - SYS_NICE
+    restart: always
+    environment:
+      - MYSQL_DATABASE=root
+      - MYSQL_ROOT_PASSWORD=root
+    ports:
+      - "3306:3306"
+    volumes:
+      - db:/var/lib/mysql
+      - ./db/init.sql:/docker-entrypoint-initdb.d/init.sql
+volumes:
+  db:
+    driver: local

query.sql

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+-- student, professor, class with class in common
+SELECT
+	CONCAT(pr.prof_fname, '', pr.prof_lname) AS professor,
+	CONCAT(st.stud_fname, '', st.stud_lname) AS student,
+	cl.class_name
+FROM
+	Professor pr
+	JOIN Class cl ON pr.prof_id = cl.prof_id
+	JOIN Enroll en ON cl.class_id = en.class_id
+	JOIN Student st ON st.stud_id = en.stud_id;
+
+-- courses that 1 professor is teaching	
+SELECT DISTINCT
+	c.course_name,
+	CONCAT(pr.prof_fname, '', pr.prof_lname) AS professor
+FROM
+	Professor pr
+	JOIN Class cl USING (prof_id)
+	JOIN Course c USING (course_id)
+
+-- courses that 1 student is enrolling
+SELECT DISTINCT
+	c.course_name,
+	CONCAT(st.stud_fname, '', st.stud_lname) AS student
+FROM
+	Student st
+	JOIN Enroll e USING (stud_id)
+	JOIN Class cl USING (class_id)
+	JOIN Course c USING (course_id);
+
+
+-- match grade in number with CHARACTER
+DROP VIEW IF EXISTS grade_in_number;
+CREATE VIEW grade_in_number AS
+SELECT
+	(
+		CASE WHEN grade = 'A' THEN
+			10
+		WHEN grade = 'B' THEN
+			8
+		WHEN grade = 'C' THEN
+			6
+		WHEN grade = 'D' THEN
+			4
+		WHEN grade = 'E' THEN
+			2
+		WHEN grade = 'F' THEN
+			0
+		END) AS grade_number, stud_id, class_id, grade
+FROM
+	Enroll;
+
+SELECT *
+FROM grade_in_number
+
+SELECT st.stud_fname, gd.grade_number, e.class_id
+FROM 
+	Student st 
+	JOIN Enroll e USING (stud_id)
+	JOIN grade_in_number gd USING (stud_id)
+
+-- avg grade in CHARACTER of 1 student
+SELECT
+	CONCAT(stud_fname, " ", stud_lname) as stud_name,
+	ROUND(AVG(
+	CASE
+		WHEN grade = 'A' THEN 10
+		WHEN grade = 'B' THEN 8
+		WHEN grade = 'C' THEN 6
+		WHEN grade = 'D' THEN 4
+		WHEN grade = 'E' THEN 2
+        WHEN grade = 'F' THEN 0
+	END
+	), 2) as academic_ability
+FROM Enroll en
+JOIN Student st
+	ON st.stud_id = en.stud_id
+GROUP BY CONCAT(stud_fname, " ", stud_lname);
+
+-- avg grade of a class
+SELECT
+	class_name,
+	ROUND(AVG(
+		CASE WHEN grade = 'A' THEN
+			10
+		WHEN grade = 'B' THEN
+			8
+		WHEN grade = 'C' THEN
+			6
+		WHEN grade = 'D' THEN
+			4
+		WHEN grade = 'E' THEN
+			2
+		WHEN grade = 'F' THEN
+			0
+		END), 2) AS grade
+FROM
+	Enroll en
+	JOIN Class cl USING (class_id)
+GROUP BY
+	class_name;
+
+-- avg grade of course
+SELECT
+	cr.course_name,
+	ROUND(AVG(
+			CASE WHEN grade = 'A' THEN
+				10
+			WHEN grade = 'B' THEN
+				8
+			WHEN grade = 'C' THEN
+				6
+			WHEN grade = 'D' THEN
+				4
+			WHEN grade = 'E' THEN
+				2
+			WHEN grade = 'F' THEN
+				0
+			END), 2) AS grade
+FROM
+	Enroll en
+	JOIN Class cl USING (class_id)
+	JOIN Course cr USING (course_id)
+GROUP BY
+	course_name;
+
+