question: What is the lowest nightly rank for an episode after episode 1 with a rating/share of 2.6/8?
answer: SELECT MIN(rank__night_) FROM table_name_91 WHERE rating / SHARE(18 - 49) = 2.6 / 8 AND episode > 1
context: CREATE TABLE table_name_91 (rank__night_ INTEGER, episode VARCHAR, rating VARCHAR)