Tim Matheson กำกับกี่ตอน?ไม่จำเป็นต้องใช้ตารางทั้งหมด
How many episodes were directed by Tim Matheson?It is not neccessary to use all the tables.
 table_25740548_2:  (original_air_date [ VARCHAR ] directed_by [ VARCHAR) ]
SELECT COUNT(original_air_date) FROM table_25740548_2 WHERE directed_by = "Tim Matheson"