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")
);

CREATE TABLE "teacher" (
"Teacher_ID" INT,
"Name" TEXT,
"Age" 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 ("1", "Alice Johnson", "29");
INSERT INTO "teacher" VALUES ("2", "Bob Smith", "45");
INSERT INTO "teacher" VALUES ("3", "Charlie Lee", "29");
INSERT INTO "teacher" VALUES ("4", "Diana Prince", "34");
INSERT INTO "teacher" VALUES ("5", "Ethan Hunt", "50");
INSERT INTO "teacher" VALUES ("6", "Fiona Gallagher", "34");
INSERT INTO "teacher" VALUES ("7", "George Martin", "22");
INSERT INTO "course_arrange" VALUES ("1", "1", "10");
INSERT INTO "course_arrange" VALUES ("2", "2", "11");
INSERT INTO "course_arrange" VALUES ("3", "3", "10");
INSERT INTO "course_arrange" VALUES ("4", "4", "12");
INSERT INTO "course_arrange" VALUES ("5", "5", "11");
INSERT INTO "course_arrange" VALUES ("1", "6", "12");
INSERT INTO "course_arrange" VALUES ("2", "7", "10");
INSERT INTO "course_arrange" VALUES ("3", "1", "11");
INSERT INTO "course_arrange" VALUES ("4", "2", "10");
INSERT INTO "course_arrange" VALUES ("5", "3", "12");