เหรียญเงินระหว่างจีนกับจีนไทเปต่างกันอย่างไร ?ไม่จำเป็นต้องใช้ทุกโต๊ะ
what is the difference in silver medals between china and chinese taipei ?It is not neccessary to use all the tables.
 table_203_576:  id [ number]  "rank" [ number]  "nation" [ text]  "gold" [ number]  "silver" [ number]  "bronze" [ number]  "total" [ number] 
SELECT (SELECT "silver" FROM table_203_576 WHERE "nation" = 'china') - (SELECT "silver" FROM table_203_576 WHERE "nation" = 'chinese taipei')