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 "singer" (
"Singer_ID" INT UNIQUE,
"Birth_Year" FLOAT,
"Citizenship" TEXT,
PRIMARY KEY ("Singer_ID")
);

CREATE TABLE "song" (
"Song_ID" INT,
"Sales" FLOAT,
"Highest_Position" FLOAT,
PRIMARY KEY ("Song_ID")
);





INSERT INTO "singer" VALUES ("1", "1985.0", "United States");
INSERT INTO "singer" VALUES ("2", "1990.5", "Canada");
INSERT INTO "singer" VALUES ("3", "NULL", "United Kingdom");
INSERT INTO "singer" VALUES ("4", "1978.25", "France");
INSERT INTO "singer" VALUES ("5", "2000.0", "Puerto Rico");
INSERT INTO "singer" VALUES ("6", "1982.0", "United States/Canada");
INSERT INTO "singer" VALUES ("7", "1995.75", "Australia");
INSERT INTO "singer" VALUES ("8", "NULL", "NULL");
INSERT INTO "singer" VALUES ("9", "1965.0", "Germany");
INSERT INTO "singer" VALUES ("10", "2010.0", "New Zealand");
INSERT INTO "singer" VALUES ("11", "1988.5", "United States");
INSERT INTO "singer" VALUES ("12", "1970.0", "Greenland");
INSERT INTO "singer" VALUES ("13", "1999.99", "United States/Mexico");
INSERT INTO "singer" VALUES ("14", "1983.0", "Brazil");
INSERT INTO "singer" VALUES ("15", "NULL", "Unknown");