Table: tv_episode_data_6
Columns: no_in_series
no_in_season
title
directed_by
written_by
original_air_date
u_s_viewers_million

Question: When did the episode "Hell bent for leather" originally air?
SQL: SELECT "original_air_date" FROM tv_episode_data_6 WHERE "title" = '"Hell Bent for Leather"'

Question: What's the season number of the episode titled "Quitters"?
SQL: SELECT MIN("no_in_season") FROM tv_episode_data_6 WHERE "title" = '"Quitters"'

Question: What's the season number of the episode watched by 0.57 million US viewers?
SQL: SELECT MAX("no_in_season") FROM tv_episode_data_6 WHERE "u_s_viewers_million" = '0.57'

Question: How many episodes were seen by 0.67 million US viewers on their original air dates?
SQL: SELECT COUNT("original_air_date") FROM tv_episode_data_6 WHERE "u_s_viewers_million" = '0.67'

Question: What episode was directed by David Duchovny?
SQL: SELECT "title" FROM tv_episode_data_6 WHERE "directed_by" = 'David Duchovny'