1 เหรียญมีกี่ชาติ ?ไม่จำเป็นต้องใช้ทุกโต๊ะ
what number of nations received 1 medal ?It is not neccessary to use all the tables.
 table_204_595:  id [ number]  "rank" [ number]  "nation" [ text]  "gold" [ number]  "silver" [ number]  "bronze" [ number]  "total" [ number] 
SELECT COUNT("nation") FROM table_204_595 WHERE "total" = 1