CREATE TABLE table_204_595 (id DECIMAL, "rank" DECIMAL, "nation" TEXT, "gold" DECIMAL, "silver" DECIMAL, "bronze" DECIMAL, "total" DECIMAL)

which countries won at least 3 silver medals ?
SELECT "nation" FROM table_204_595 WHERE "silver" >= 3
SELECT "nation" FROM "table_204_595" WHERE "silver" >= 3