นัดไหนได้ 240 แต้ม ไม่จำเป็นต้องใช้ทุกโต๊ะ
What match had 240 points for?It is not neccessary to use all the tables.
 table_name_81:  (matches [ VARCHAR ] points_for [ VARCHAR) ]
SELECT matches FROM table_name_81 WHERE points_for = "240"