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 ("Course_ID") REFERENCES "course"("Course_ID")
);

CREATE TABLE "teacher" (
"Teacher_ID" INT UNIQUE,
"Name" TEXT,
"Age" TEXT,
"Hometown" 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", "45", "New York");
INSERT INTO "teacher" VALUES ("102", "Bob Smith", "38", "Los Angeles");
INSERT INTO "teacher" VALUES ("103", "Carol White", "29", "Chicago");
INSERT INTO "teacher" VALUES ("104", "David Brown", "52", "Houston");
INSERT INTO "teacher" VALUES ("105", "Eva Green", "41", "Phoenix");
INSERT INTO "teacher" VALUES ("106", "Frank Black", "60", "Philadelphia");
INSERT INTO "teacher" VALUES ("107", "Grace Lee", "35", "San Antonio");
INSERT INTO "teacher" VALUES ("108", "Henry Adams", "28", "San Diego");
INSERT INTO "teacher" VALUES ("109", "Ivy Wilson", "33", "Dallas");
INSERT INTO "teacher" VALUES ("110", "Jackie Miller", "47", "San Jose");
INSERT INTO "course_arrange" VALUES ("1", "101", "10");
INSERT INTO "course_arrange" VALUES ("2", "101", "11");
INSERT INTO "course_arrange" VALUES ("3", "102", "10");
INSERT INTO "course_arrange" VALUES ("4", "103", "12");
INSERT INTO "course_arrange" VALUES ("5", "104", "11");
INSERT INTO "course_arrange" VALUES ("1", "105", "12");
INSERT INTO "course_arrange" VALUES ("2", "106", "10");
INSERT INTO "course_arrange" VALUES ("3", "107", "11");
INSERT INTO "course_arrange" VALUES ("4", "108", "10");
INSERT INTO "course_arrange" VALUES ("5", "109", "12");
INSERT INTO "course_arrange" VALUES ("1", "110", "11");
INSERT INTO "course_arrange" VALUES ("2", "110", "12");