เขาเล่นเองไปกี่รอบแล้ว ?ไม่จำเป็นต้องใช้โต๊ะทั้งหมดก็ได้
on how many shows did he play himself ?It is not neccessary to use all the tables.
 table_203_173:  id [ number]  "year(s)" [ text]  "role" [ text]  "co-star" [ text]  "note(s)" [ text]  "channel" [ text] 
SELECT COUNT("serial name") FROM table_203_173 WHERE "role" = 'himself'