CREATE TABLE IF NOT EXISTS student (
id INTEGER PRIMARY KEY,
name VARCHAR(30),
type VARCHAR(10), -- 'undergraduate' | 'master' | 'doctor'
enrollmentYear SMALLINT
);
CREATE TABLE IF NOT EXISTS course (
id INTEGER PRIMARY KEY AUTOINCREMENT,
name VARCHAR(30) UNIQUE,
description VARCHAR(200)
);
CREATE TABLE IF NOT EXISTS grade (
id INTEGER PRIMARY KEY AUTOINCREMENT,
studentId INTEGER NOT NULL,
courseId INTEGER NOT NULL,
takeTime VARCHAR(20), -- eg. '2016first', '2015second'
score INTEGER,
FOREIGN KEY (courseId) REFERENCES course(id),
FOREIGN KEY (studentId) REFERENCES student(id)
);