CREATE TABLE table_203_576 (id DECIMAL, "rank" DECIMAL, "nation" TEXT, "gold" DECIMAL, "silver" DECIMAL, "bronze" DECIMAL, "total" DECIMAL)

which country won the least medals ?
SELECT "nation" FROM table_203_576 ORDER BY "total" LIMIT 1
SELECT "nation" FROM "table_203_576" ORDER BY "total" NULLS FIRST LIMIT 1