Warren Leight เขียนไว้กี่ตอน?ไม่จำเป็นต้องใช้ตารางทั้งหมด
How many episodes were written by Warren Leight?It is not neccessary to use all the tables.
 table_29154676_1:  (season_no [ VARCHAR ] written_by [ VARCHAR) ]
SELECT COUNT(season_no) FROM table_29154676_1 WHERE written_by = "Warren Leight"