Table: tv_episodes_36
Columns: no
title
directed_by
written_by
u_s_viewers_million
rank_week
original_air_date
production_code

Question: What is the production code for the episode that had 18.07 million viewers? 
SQL: SELECT "production_code" FROM tv_episodes_36 WHERE "u_s_viewers_million" = '18.07'

Question: What is the weeks rank for the episode with the production code 1alf05? 
SQL: SELECT MAX("rank_week") FROM tv_episodes_36 WHERE "production_code" = '1ALF05'

Question: How many air dates does the episode with 15.50 million viewers have? 
SQL: SELECT COUNT("original_air_date") FROM tv_episodes_36 WHERE "u_s_viewers_million" = '15.50'

Question: Who wrote the episode with 18.07 million viewers? 
SQL: SELECT "written_by" FROM tv_episodes_36 WHERE "u_s_viewers_million" = '18.07'