CREATE TABLE table_name_27 (rating INTEGER, episode VARCHAR(255), rank__night_ VARCHAR(255), rank__timeslot_ VARCHAR(255))
What is the smallest rating with nightly rank smaller than 7, timeslot rank smaller than 5 and eposide after episode 6?
    
SQL: SELECT MIN(rating) FROM table_name_27 WHERE rank__night_ < 7 AND rank__timeslot_ < 5 AND episode > 6