CREATE TABLE table_203_175 (id DECIMAL, "rank" TEXT, "nation" TEXT, "gold" DECIMAL, "silver" DECIMAL, "bronze" DECIMAL, "total" DECIMAL)

what country had the most medals ?
SELECT "nation" FROM table_203_175 ORDER BY "total" DESC LIMIT 1
SELECT "nation" FROM "table_203_175" ORDER BY "total" DESC NULLS LAST LIMIT 1