Table schema:
CREATE TABLE table_name_27 (rating INTEGER, episode VARCHAR, rank__night_ VARCHAR, rank__timeslot_ VARCHAR)

Question: 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