มีคู่ต่อสู้ทั้งหมดกี่คน ?ไม่จำเป็นต้องใช้โต๊ะทั้งหมด
how many total opponents are there ?It is not neccessary to use all the tables.
 table_204_441:  id [ number]  "date" [ text]  "opponent" [ text]  "venue" [ text]  "result" [ text]  "attendance" [ number]  "scorers" [ text] 
SELECT COUNT("opponent") FROM table_204_441