Table: tv_episode_data_22
Columns: col
episode
writer
director
original_air_date
viewing_figure

Question: Who is the director of the episode at entry number 13? 
SQL: SELECT "director" FROM tv_episode_data_22 WHERE "col" = 13

Question: Who wrote the episode that David Tucker directed?
SQL: SELECT COUNT("writer") FROM tv_episode_data_22 WHERE "director" = 'David Tucker'

Question: Which episode has been viewed 6.34 million times? 
SQL: SELECT "episode" FROM tv_episode_data_22 WHERE "viewing_figure" = '6.34 million'

Question: What is the original air date of the episode directed by Paul Marcus?
SQL: SELECT "original_air_date" FROM tv_episode_data_22 WHERE "director" = 'Paul Marcus'

Question: Which numerical entry corresponds to "Episode 9"?
SQL: SELECT COUNT("col") FROM tv_episode_data_22 WHERE "episode" = '"Episode 9"'