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30 changes: 30 additions & 0 deletions sol-1.sql
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-- capital_gain_loss
select stock_name,
SUM(
CASE
WHEN operation = "Buy" THEN price * -1
ELSE price
END
) AS capital_gain_loss
from Stocks
group by stock_name;

--count_salary_categories.sql
SELECT type.category AS category ,
COUNT(account_id) AS accounts_count
FROM (
SELECT 'Low Salary' AS category
UNION
SELECT 'Average Salary' AS category
UNION
SELECT 'High Salary' AS category
) AS type
LEFT JOIN accounts AS accounts
ON type.category = (
CASE
WHEN accounts.income > 50000 THEN "High Salary"
WHEN accounts.income >= 20000 THEN "Average Salary"
ELSE "Low Salary"
END
)
group by type.category;
223 changes: 223 additions & 0 deletions sol-2.sql
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SET @OLD_UNIQUE_CHECKS=@@UNIQUE_CHECKS, UNIQUE_CHECKS=0;
SET @OLD_FOREIGN_KEY_CHECKS=@@FOREIGN_KEY_CHECKS, FOREIGN_KEY_CHECKS = 0;
SET @OLD_SQL_MODE=@@SQL_MODE, SQL_MODE = 'TRADITIONAL,ALLOW_INVALID_DATES';

------------------------------------------ CREATE DATABASE --------------------------------------------------------
DROP DATABASE IF EXISTS `SCHOOL`;
CREATE DATABASE IF NOT EXISTS `SCHOOL`;
USE `SCHOOL`;

CREATE TABLE IF NOT EXISTS PROFFESSOR (
`PROF_ID` INT AUTO_INCREMENT PRIMARY KEY,
`PROF_LNAME` VARCHAR(50) NOT NULL,
`PROF_FNAME` VARCHAR(50) NOT NULL
);

CREATE TABLE IF NOT EXISTS STUDENT (
`STUD_ID` INT AUTO_INCREMENT PRIMARY KEY,
`STUD_FNAME` VARCHAR(10) NOT NULL,
`STUD_LNAME` VARCHAR(10) NOT NULL,
`STUD_STREET` VARCHAR(10) DEFAULT NULL,
`STUD_CITY` VARCHAR(10) NULL DEFAULT NULL,
`STUD_ZIP` VARCHAR(10) NULL DEFAULT NULL
);

CREATE TABLE IF NOT EXISTS COURSE (
`COURSE_ID` INT AUTO_INCREMENT PRIMARY KEY,
`COURSE_NAME` VARCHAR(255) NOT NULL
);

CREATE TABLE IF NOT EXISTS CLASS(
`CLASS_ID` INT AUTsO_INCREMENT PRIMARY KEY,
`CLASS_NAME` VARCHAR(255),
`PROF_ID` INT,
`COURSE_ID` INT,
FOREIGN KEY (`PROF_ID`) REFERENCES `PROFFESSOR` (`PROF_ID`) ON UPDATE RESTRICT ON DELETE RESTRICT,
FOREIGN KEY (`COURSE_ID`) REFERENCES `COURSE` (`COURSE_ID`) ON UPDATE RESTRICT ON DELETE RESTRICT
);

CREATE TABLE IF NOT EXISTS ROOM (
`ROOM_ID` INT AUTO_INCREMENT PRIMARY KEY,
`ROOM_LOC` VARCHAR(50),
`ROOM_CAP` VARCHAR(50),
`CLASS_ID` INT,
FOREIGN KEY (`CLASS_ID`) REFERENCES `CLASS`(`CLASS_ID`) ON UPDATE RESTRICT ON DELETE RESTRICT
);

CREATE TABLE IF NOT EXISTS ENROLL(
`STUD_ID` INT AUTO_INCREMENT,
`CLASS_ID` INT,
`GRADE` VARCHAR(3),
FOREIGN KEY (`STUD_ID`) REFERENCES `STUDENT`(`STUD_ID`) ON UPDATE RESTRICT ON DELETE RESTRICT,
FOREIGN KEY (`CLASS_ID`) REFERENCES `CLASS`(`CLASS_ID`) ON UPDATE RESTRICT ON DELETE RESTRICT,
PRIMARY KEY (`STUD_ID`, `CLASS_ID`)
);

------------------------------------------ INSERT DATABASE --------------------------------------------------------
-- PROFFESSOR
INSERT INTO `PROFFESSOR` (`PROF_FNAME`, `PROF_LNAME`) VALUES('Peter','John');
INSERT INTO `PROFFESSOR` (`PROF_FNAME`, `PROF_LNAME`) VALUES('Adam','Smith');
INSERT INTO `PROFFESSOR` (`PROF_FNAME`, `PROF_LNAME`) VALUES('Warrent','Bridge');
INSERT INTO `PROFFESSOR` (`PROF_FNAME`, `PROF_LNAME`) VALUES('Peterson','Wick');
INSERT INTO `PROFFESSOR` (`PROF_FNAME`, `PROF_LNAME`) VALUES('Hello','World');
INSERT INTO `PROFFESSOR` (`PROF_FNAME`, `PROF_LNAME`) VALUES('Professor','Wong');

-- PROFFESSOR
INSERT INTO `STUDENT` (`STUD_FNAME`, `STUD_LNAME`,`STUD_STREET`,`STUD_CITY`,`STUD_ZIP`) VALUES ('Adam','John', 'street 1','city 1','zip 1');
INSERT INTO `STUDENT` (`STUD_FNAME`, `STUD_LNAME`,`STUD_STREET`,`STUD_CITY`,`STUD_ZIP`) VALUES ('Peter','John','street 2','city 2','zip 2');
INSERT INTO `STUDENT` (`STUD_FNAME`, `STUD_LNAME`,`STUD_STREET`,`STUD_CITY`,`STUD_ZIP`) VALUES ('Harry','Kane','street 3','city 3','zip 3');
INSERT INTO `STUDENT` (`STUD_FNAME`, `STUD_LNAME`,`STUD_STREET`,`STUD_CITY`,`STUD_ZIP`) VALUES ('Ronie','Smith','street 4','city 4','zip 4');
INSERT INTO `STUDENT` (`STUD_FNAME`, `STUD_LNAME`,`STUD_STREET`,`STUD_CITY`,`STUD_ZIP`) VALUES ('Luke','Shaw', 'street 5','city 5','zip 5');
INSERT INTO `STUDENT` (`STUD_FNAME`, `STUD_LNAME`,`STUD_STREET`,`STUD_CITY`,`STUD_ZIP`) VALUES ('Helen','Dane','street 6','city 6','zip 6');
INSERT INTO `STUDENT` (`STUD_FNAME`, `STUD_LNAME`,`STUD_STREET`,`STUD_CITY`,`STUD_ZIP`) VALUES ('Danie','John','street 7','city 7','zip 7');
INSERT INTO `STUDENT` (`STUD_FNAME`, `STUD_LNAME`,`STUD_STREET`,`STUD_CITY`,`STUD_ZIP`) VALUES ('Mike','Gil', 'street 8','city 8','zip 8');
INSERT INTO `STUDENT` (`STUD_FNAME`, `STUD_LNAME`,`STUD_STREET`,`STUD_CITY`,`STUD_ZIP`) VALUES ('Sauny','Curry','street 9','city 9','zip 9');
INSERT INTO `STUDENT` (`STUD_FNAME`, `STUD_LNAME`,`STUD_STREET`,`STUD_CITY`,`STUD_ZIP`) VALUES ('Adama','Stone','street 10','city 10','zip 10');
-- COURSE
INSERT INTO `COURSE` (`COURSE_NAME`) VALUES('PROGRAMING');
INSERT INTO `COURSE` (`COURSE_NAME`) VALUES('BIOLOGY');
INSERT INTO `COURSE` (`COURSE_NAME`) VALUES('MATH');
INSERT INTO `COURSE` (`COURSE_NAME`) VALUES('ENGLISH');
INSERT INTO `COURSE` (`COURSE_NAME`) VALUES('PHYSICS');
-- CLASS
INSERT INTO `CLASS` (`CLASS_NAME`,`PROF_ID`,`COURSE_ID`) VALUES('CLASS-A1',1,1);
INSERT INTO `CLASS` (`CLASS_NAME`,`PROF_ID`,`COURSE_ID`) VALUES('CLASS-A2',2,3);
INSERT INTO `CLASS` (`CLASS_NAME`,`PROF_ID`,`COURSE_ID`) VALUES('CLASS-A3',3,5);
INSERT INTO `CLASS` (`CLASS_NAME`,`PROF_ID`,`COURSE_ID`) VALUES('CLASS-A4',5,4);
INSERT INTO `CLASS` (`CLASS_NAME`,`PROF_ID`,`COURSE_ID`) VALUES('CLASS-A5',6,2);
INSERT INTO `CLASS` (`CLASS_NAME`,`PROF_ID`,`COURSE_ID`) VALUES('CLASS-A6',1,1);
INSERT INTO `CLASS` (`CLASS_NAME`,`PROF_ID`,`COURSE_ID`) VALUES('CLASS-A7',4,5);
INSERT INTO `CLASS` (`CLASS_NAME`,`PROF_ID`,`COURSE_ID`) VALUES('CLASS-A8',6,3);
INSERT INTO `CLASS` (`CLASS_NAME`,`PROF_ID`,`COURSE_ID`) VALUES('CLASS-A9',3,2);
INSERT INTO `CLASS` (`CLASS_NAME`,`PROF_ID`,`COURSE_ID`) VALUES('CLASS-A10',4,4);
INSERT INTO `CLASS` (`CLASS_NAME`,`PROF_ID`,`COURSE_ID`) VALUES('CLASS-A11',2,5);
INSERT INTO `CLASS` (`CLASS_NAME`,`PROF_ID`,`COURSE_ID`) VALUES('CLASS-A12',2,3);
INSERT INTO `CLASS` (`CLASS_NAME`,`PROF_ID`,`COURSE_ID`) VALUES('CLASS-A13',5,1);
-- ROOM
INSERT INTO `ROOM` (`ROOM_LOC`, `ROOM_CAP`, `CLASS_ID`) VALUES('LOC-1',30,1);
INSERT INTO `ROOM` (`ROOM_LOC`, `ROOM_CAP`, `CLASS_ID`) VALUES('LOC-2',30,2);
INSERT INTO `ROOM` (`ROOM_LOC`, `ROOM_CAP`, `CLASS_ID`) VALUES('LOC-3',30,3);
INSERT INTO `ROOM` (`ROOM_LOC`, `ROOM_CAP`, `CLASS_ID`) VALUES('LOC-4',30,4);
INSERT INTO `ROOM` (`ROOM_LOC`, `ROOM_CAP`, `CLASS_ID`) VALUES('LOC-5',30,5);
INSERT INTO `ROOM` (`ROOM_LOC`, `ROOM_CAP`, `CLASS_ID`) VALUES('LOC-6',30,6);
INSERT INTO `ROOM` (`ROOM_LOC`, `ROOM_CAP`, `CLASS_ID`) VALUES('LOC-7',30,7);
INSERT INTO `ROOM` (`ROOM_LOC`, `ROOM_CAP`, `CLASS_ID`) VALUES('LOC-8',30,8);
INSERT INTO `ROOM` (`ROOM_LOC`, `ROOM_CAP`, `CLASS_ID`) VALUES('LOC-9',30,9);
INSERT INTO `ROOM` (`ROOM_LOC`, `ROOM_CAP`, `CLASS_ID`) VALUES('LOC-10',30,10);
INSERT INTO `ROOM` (`ROOM_LOC`, `ROOM_CAP`, `CLASS_ID`) VALUES('LOC-11',30,11);
INSERT INTO `ROOM` (`ROOM_LOC`, `ROOM_CAP`, `CLASS_ID`) VALUES('LOC-12',30,12);
INSERT INTO `ROOM` (`ROOM_LOC`, `ROOM_CAP`, `CLASS_ID`) VALUES('LOC-13',30,13);
-- ENROLL
INSERT INTO `ENROLL` (`STUD_ID`, `CLASS_ID`, `GRADE`) VALUES(1,1,'GR');
INSERT INTO `ENROLL` (`STUD_ID`, `CLASS_ID`, `GRADE`) VALUES(1,2,'GR');
INSERT INTO `ENROLL` (`STUD_ID`, `CLASS_ID`, `GRADE`) VALUES(1,3,'GR');
INSERT INTO `ENROLL` (`STUD_ID`, `CLASS_ID`, `GRADE`) VALUES(2,3,'GR');
INSERT INTO `ENROLL` (`STUD_ID`, `CLASS_ID`, `GRADE`) VALUES(2,4,'GR');
INSERT INTO `ENROLL` (`STUD_ID`, `CLASS_ID`, `GRADE`) VALUES(2,5,'GR');
INSERT INTO `ENROLL` (`STUD_ID`, `CLASS_ID`, `GRADE`) VALUES(2,6,'GR');
INSERT INTO `ENROLL` (`STUD_ID`, `CLASS_ID`, `GRADE`) VALUES(3,6,'GR');
INSERT INTO `ENROLL` (`STUD_ID`, `CLASS_ID`, `GRADE`) VALUES(3,7,'GR');
INSERT INTO `ENROLL` (`STUD_ID`, `CLASS_ID`, `GRADE`) VALUES(3,8,'GR');
INSERT INTO `ENROLL` (`STUD_ID`, `CLASS_ID`, `GRADE`) VALUES(4,8,'GR');
INSERT INTO `ENROLL` (`STUD_ID`, `CLASS_ID`, `GRADE`) VALUES(4,9,'GR');
INSERT INTO `ENROLL` (`STUD_ID`, `CLASS_ID`, `GRADE`) VALUES(4,10,'GR');
INSERT INTO `ENROLL` (`STUD_ID`, `CLASS_ID`, `GRADE`) VALUES(5,10,'GR');
INSERT INTO `ENROLL` (`STUD_ID`, `CLASS_ID`, `GRADE`) VALUES(5,11,'GR');
INSERT INTO `ENROLL` (`STUD_ID`, `CLASS_ID`, `GRADE`) VALUES(5,12,'GR');
INSERT INTO `ENROLL` (`STUD_ID`, `CLASS_ID`, `GRADE`) VALUES(6,11,'GR');
INSERT INTO `ENROLL` (`STUD_ID`, `CLASS_ID`, `GRADE`) VALUES(6,12,'GR');
INSERT INTO `ENROLL` (`STUD_ID`, `CLASS_ID`, `GRADE`) VALUES(6,13,'GR');
INSERT INTO `ENROLL` (`STUD_ID`, `CLASS_ID`, `GRADE`) VALUES(6,13,'GR');
INSERT INTO `ENROLL` (`STUD_ID`, `CLASS_ID`, `GRADE`) VALUES(7,12,'GR');
INSERT INTO `ENROLL` (`STUD_ID`, `CLASS_ID`, `GRADE`) VALUES(7,14,'GR');
INSERT INTO `ENROLL` (`STUD_ID`, `CLASS_ID`, `GRADE`) VALUES(8,15,'GR');
INSERT INTO `ENROLL` (`STUD_ID`, `CLASS_ID`, `GRADE`) VALUES(8,16,'GR');
INSERT INTO `ENROLL` (`STUD_ID`, `CLASS_ID`, `GRADE`) VALUES(9,16,'GR');
INSERT INTO `ENROLL` (`STUD_ID`, `CLASS_ID`, `GRADE`) VALUES(10,16,'GR');
INSERT INTO `ENROLL` (`STUD_ID`, `CLASS_ID`, `GRADE`) VALUES(8,16,'GR');
INSERT INTO `ENROLL` (`STUD_ID`, `CLASS_ID`, `GRADE`) VALUES(7,16,'GR');
INSERT INTO `ENROLL` (`STUD_ID`, `CLASS_ID`, `GRADE`) VALUES(10,15,'GR');
INSERT INTO `ENROLL` (`STUD_ID`, `CLASS_ID`, `GRADE`) VALUES(6,16,'GR');
INSERT INTO `ENROLL` (`STUD_ID`, `CLASS_ID`, `GRADE`) VALUES(4,13,'GR');

------------------------------------------ QUERY DATABASE --------------------------------------------------------

-- những cặp student-professor có dạy học nhau và số lớp mà họ có liên quan
SELECT CONCAT(P.PROF_FNAME , " " , P.PROF_LNAME) AS PROFFESSOR_NAME,
CONCAT(S.STUD_FNAME , " " , S.STUD_LNAME) AS STUDENT_NAME,
COUNT(C.CLASS_ID) AS TIME_MEET
FROM PROFFESSOR AS P
INNER JOIN CLASS AS C ON C.PROF_ID = P.PROF_ID
INNER JOIN ENROLL AS E ON E.CLASS_ID = C.CLASS_ID
INNER JOIN STUDENT AS S ON S.STUD_ID = E.STUD_ID
GROUP BY PROFFESSOR_NAME,STUDENT_NAME;

-- những course (distinct) mà 1 professor cụ thể đang dạy
SELECT COURSE.COURSE_NAME
FROM COURSE
INNER JOIN CLASS ON CLASS.COURSE_ID = COURSE.COURSE_ID
INNER JOIN PROFFESSOR AS P ON P.PROF_ID = CLASS.PROF_ID
WHERE P.PROF_ID = 2
GROUP BY COURSE.COURSE_NAME;

-- những course (distinct) mà 1 student cụ thể đang học
SELECT COURSE.COURSE_NAME
FROM COURSE
INNER JOIN CLASS ON CLASS.COURSE_ID = COURSE.COURSE_ID
INNER JOIN ENROLL AS E ON E.CLASS_ID = CLASS.CLASS_ID
INNER JOIN STUDENT AS S ON S.STUD_ID = E.STUD_ID
WHERE S.STUD_ID = 1
GROUP BY COURSE.COURSE_NAME;

-- điểm số là A, B, C, D, E, F tương đương với 10, 8, 6, 4, 2, 0, điểm số trung bình của 1 học sinh cụ thể (quy ra lại theo chữ cái, và xếp loại học lực (weak nếu avg < 5, average nếu >=5 < 8, good nếu >=8 )
SELECT (
CASE
WHEN AVG(E.GRADE) >= 8 THEN "good"
WHEN AVG(E.GRADE) >= 5 THEN "average"
ELSE "weak"
END) AS LEVEL,
(CASE
WHEN AVG(E.GRADE) = 10 THEN "A"
WHEN AVG(E.GRADE) >= 8 THEN "B"
WHEN AVG(E.GRADE) >= 6 THEN "C"
WHEN AVG(E.GRADE) >= 4 THEN "D"
WHEN AVG(E.GRADE) >= 2 THEN "E"
ELSE "F"
END) AS MARK_LETTER,
CONCAT(S.STUD_FNAME , " " , S.STUD_LNAME) AS STUDENT_NAME
FROM STUDENT AS S
JOIN ENROLL AS E
GROUP BY S.STUD_ID, STUDENT_NAME;

-- điểm số trung bình của các class (quy ra lại theo chữ cái)

SELECT
(CASE
WHEN AVG(E.GRADE) = 10 THEN "A"
WHEN AVG(E.GRADE) >= 8 THEN "B"
WHEN AVG(E.GRADE) >= 6 THEN "C"
WHEN AVG(E.GRADE) >= 4 THEN "D"
WHEN AVG(E.GRADE) >= 2 THEN "E"
ELSE "F"
END) AS MARK_LETTER, C.CLASS_NAME
FROM CLASS AS C
JOIN ENROLL AS E ON E.CLASS_ID = C.CLASS_ID
GROUP BY C.CLASS_ID;

-- điểm số trung bình của các course (quy ra lại theo chữ cái)

SELECT
(CASE
WHEN AVG(E.GRADE) = 10 THEN "A"
WHEN AVG(E.GRADE) >= 8 THEN "B"
WHEN AVG(E.GRADE) >= 6 THEN "C"
WHEN AVG(E.GRADE) >= 4 THEN "D"
WHEN AVG(E.GRADE) >= 2 THEN "E"
ELSE "F"
END) AS MARK_LETTER, COURSE.COURSE_NAME
FROM CLASS
JOIN COURSE ON COURSE.COURSE_ID = CLASS.COURSE_ID
JOIN ENROLL AS E ON E.CLASS_ID = CLASS.CLASS_ID
GROUP BY COURSE.COURSE_ID;