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 "concert" (
"concert_ID" INT,
"Year" TEXT,
PRIMARY KEY ("concert_ID")
);

CREATE TABLE "singer" (
"Singer_ID" INT,
"Country" TEXT,
"Song_release_year" TEXT,
"Age" INT,
PRIMARY KEY ("Singer_ID")
);

CREATE TABLE "stadium" (
"Stadium_ID" INT,
"Location" TEXT,
PRIMARY KEY ("Stadium_ID")
);





INSERT INTO "concert" VALUES ("1", "2014");
INSERT INTO "concert" VALUES ("2", "2015");
INSERT INTO "concert" VALUES ("3", "2016");
INSERT INTO "concert" VALUES ("4", "2017");
INSERT INTO "concert" VALUES ("5", "2018");
INSERT INTO "singer" VALUES ("1", "France", "2010", "25");
INSERT INTO "singer" VALUES ("2", "United States", "2012", "20");
INSERT INTO "singer" VALUES ("3", "Netherlands", "2015", "19");
INSERT INTO "singer" VALUES ("4", "Brazil", "2011", "30");
INSERT INTO "singer" VALUES ("5", "Japan", "2013", "22");
INSERT INTO "singer" VALUES ("6", "Nigeria", "2014", "21");
INSERT INTO "singer" VALUES ("7", "India", "2016", "18");
INSERT INTO "singer" VALUES ("8", "South Africa", "2017", "20");
INSERT INTO "singer" VALUES ("9", "Mexico", "2018", "23");
INSERT INTO "singer" VALUES ("10", "Canada", "2019", "NULL");
INSERT INTO "singer" VALUES ("11", "France", "2020", "45");
INSERT INTO "singer" VALUES ("12", "United States", "2021", "17");
INSERT INTO "singer" VALUES ("13", "Argentina", "2010", "50");
INSERT INTO "singer" VALUES ("14", "Egypt", "2012", "21");
INSERT INTO "singer" VALUES ("15", "Russia", "2013", "20");
INSERT INTO "stadium" VALUES ("1", "Paris");
INSERT INTO "stadium" VALUES ("2", "New York");
INSERT INTO "stadium" VALUES ("3", "Amsterdam");
INSERT INTO "stadium" VALUES ("4", "Rio de Janeiro");
INSERT INTO "stadium" VALUES ("5", "Tokyo");