บัลจิกเล่นฝ่ายตรงข้ามได้กี่คน ?ไม่จำเป็นต้องใช้โต๊ะทั้งหมด
how many different opponents did baljic play ?It is not neccessary to use all the tables.
 table_203_179:  id [ number]  "goal" [ number]  "date" [ text]  "venue" [ text]  "opponent" [ text]  "score" [ text]  "result" [ text]  "competition" [ text] 
SELECT COUNT(DISTINCT "opponent") FROM table_203_179