David Duchovny กำกับตอนกี่ตอน?ไม่จำเป็นต้องใช้ตารางทั้งหมด
How many episodes have been directed by David Duchovny?It is not neccessary to use all the tables.
 table_13336122_3:  (title [ VARCHAR ] directed_by [ VARCHAR) ]
SELECT COUNT(title) FROM table_13336122_3 WHERE directed_by = "David Duchovny"