PRAGMA foreign_keys = ON;

PRAGMA writable_schema = 1;
DELETE FROM sqlite_master WHERE type IN ("table", "index", "trigger");
PRAGMA writable_schema = 0;
VACUUM;

CREATE TABLE "course" (
"Course_ID" INT,
"Course" TEXT,
PRIMARY KEY ("Course_ID")
);

CREATE TABLE "course_arrange" (
"Course_ID" INT,
"Teacher_ID" INT,
"Grade" INT,
PRIMARY KEY ("Course_ID", "Teacher_ID", "Grade"),
FOREIGN KEY ("Teacher_ID") REFERENCES "teacher"("Teacher_ID"),
FOREIGN KEY ("Course_ID") REFERENCES "course"("Course_ID")
);

CREATE TABLE "teacher" (
"Teacher_ID" INT UNIQUE,
"Name" TEXT,
PRIMARY KEY ("Teacher_ID")
);





INSERT INTO "course" VALUES ("1", "Mathematics");
INSERT INTO "course" VALUES ("2", "Physics");
INSERT INTO "course" VALUES ("3", "Chemistry");
INSERT INTO "course" VALUES ("4", "Biology");
INSERT INTO "course" VALUES ("5", "History");
INSERT INTO "teacher" VALUES ("101", "Alice Johnson");
INSERT INTO "teacher" VALUES ("102", "Bob Smith");
INSERT INTO "teacher" VALUES ("103", "Charlie Lee");
INSERT INTO "teacher" VALUES ("104", "Diana Prince");
INSERT INTO "teacher" VALUES ("105", "Ethan Hunt");
INSERT INTO "teacher" VALUES ("106", "Fiona Gallagher");
INSERT INTO "teacher" VALUES ("107", "George Martin");
INSERT INTO "course_arrange" VALUES ("1", "101", "9");
INSERT INTO "course_arrange" VALUES ("2", "102", "10");
INSERT INTO "course_arrange" VALUES ("3", "101", "11");
INSERT INTO "course_arrange" VALUES ("4", "103", "9");
INSERT INTO "course_arrange" VALUES ("5", "104", "12");
INSERT INTO "course_arrange" VALUES ("1", "105", "10");
INSERT INTO "course_arrange" VALUES ("2", "105", "11");
INSERT INTO "course_arrange" VALUES ("3", "102", "12");