Table: torchwood_episode_data
Columns: children_of_earth
run_time
writer
director
original_airdate
viewers_including_hd_in_millions

Question: Who is the writer of Children of Earth of "day four"?
SQL: SELECT "writer" FROM torchwood_episode_data WHERE "children_of_earth" = '"day four"'

Question: How many viewers were there for Children of Earth of "day one"?
SQL: SELECT "viewers_including_hd_in_millions" FROM torchwood_episode_data WHERE "children_of_earth" = '"day one"'

Question: Who was the director of Children of Earth of "day five"?
SQL: SELECT "director" FROM torchwood_episode_data WHERE "children_of_earth" = '"day five"'

Question: Who was the director of the episode written by Russell T Davies and James Moran?
SQL: SELECT "director" FROM torchwood_episode_data WHERE "writer" = 'russell t davies and james moran'