CREATE TABLE table_203_252 (id DECIMAL, "draw" DECIMAL, "country" TEXT, "language" TEXT, "artist" TEXT, "song" TEXT, "english translation" TEXT, "place" DECIMAL, "points" DECIMAL)

what is the difference in points between first and last place ?
SELECT (SELECT "points" FROM table_203_252 ORDER BY "points" DESC LIMIT 1) - (SELECT "points" FROM table_203_252 ORDER BY "points" LIMIT 1)
SELECT (SELECT "points" FROM "table_203_252" ORDER BY "points" DESC NULLS LAST LIMIT 1) - (SELECT "points" FROM "table_203_252" ORDER BY "points" NULLS FIRST LIMIT 1)