CREATE TABLE table_203_612 (id DECIMAL, "rank" DECIMAL, "nation" TEXT, "gold" DECIMAL, "silver" DECIMAL, "bronze" DECIMAL, "total" DECIMAL)

which countries have earned no more than one gold medal ?
SELECT "nation" FROM table_203_612 WHERE "gold" <= 1
SELECT "nation" FROM "table_203_612" WHERE "gold" <= 1