Table: tv_episode_data_79
Columns: no_in_series
no_in_season
title
directed_by
written_by
original_air_date
production_code
u_s_viewers_million

Question: Who wrote the episode that has a production code 3x7557?
SQL: SELECT "written_by" FROM tv_episode_data_79 WHERE "production_code" = '3X7557'

Question: How many directors are there for the episode that had 1.59 million U.S. viewers?
SQL: SELECT COUNT("directed_by") FROM tv_episode_data_79 WHERE "u_s_viewers_million" = '1.59'

Question: What is the production code for the episode that had 1.32 million U.S. viewers?
SQL: SELECT "production_code" FROM tv_episode_data_79 WHERE "u_s_viewers_million" = '1.32'

Question: What episode number in the series had a production code of 3x7554?
SQL: SELECT MIN("no_in_series") FROM tv_episode_data_79 WHERE "production_code" = '3X7554'

Question: What is the name of episode number 41 in the series?
SQL: SELECT "title" FROM tv_episode_data_79 WHERE "no_in_series" = 41