Table: tv_episode_23
Columns: no
title
directed_by
written_by
original_air_date
production_code
u_s_viewers_million

Question: Who wrote the episode that had 6.05 million U.s. viewers?
SQL: SELECT "written_by" FROM tv_episode_23 WHERE "u_s_viewers_million" = '6.05'

Question: How many production codes are there for the episode that had 4.36 million u.s. viewers?
SQL: SELECT COUNT("production_code") FROM tv_episode_23 WHERE "u_s_viewers_million" = '4.36'

Question: How many people wrote the episode that had 7.26 million u.s. viewers?
SQL: SELECT COUNT("written_by") FROM tv_episode_23 WHERE "u_s_viewers_million" = '7.26'

Question: How many million u.s. viewers saw the episode that was directed by roger young and written by debra j. fisher?
SQL: SELECT "u_s_viewers_million" FROM tv_episode_23 WHERE "directed_by" = 'Roger Young' AND "written_by" = 'Debra J. Fisher'

Question: What is the name of the episode written by David Matthews?
SQL: SELECT "title" FROM tv_episode_23 WHERE "written_by" = 'David Matthews'