John Rogers กำกับตอนใด?ไม่จำเป็นต้องใช้ตารางทั้งหมด
What episode did John Rogers direct?It is not neccessary to use all the tables.
 table_20704243_6:  (title [ VARCHAR ] directed_by [ VARCHAR) ]
SELECT title FROM table_20704243_6 WHERE directed_by = "John Rogers"