Tom Garrigus เขียนตอนใดของซีซันและมีผู้ชม 2.31 ล้านคน? ไม่จำเป็นต้องใช้ตารางทั้งหมด
What episode number of the season was written by Tom Garrigus and had 2.31 million u.s. viewers?It is not neccessary to use all the tables.
 table_28019988_5:  (season__number [ INTEGER ] us_viewers__million_ [ VARCHAR ] written_by [ VARCHAR) ]
SELECT MAX(season__number) FROM table_28019988_5 WHERE us_viewers__million_ = "2.31" AND written_by = "Tom Garrigus"