Table: episode_data_12
Columns: no_in_series
title
directed_by
written_by
original_air_date
prod_code
viewers_millions

Question: Who directed the episode titled "Smells Like Teen Sellout"?
SQL: SELECT "directed_by" FROM episode_data_12 WHERE "title" = '"Smells Like Teen Sellout"'

Question: Which title, directed by David Kendall, had 3.7 million viewers?
SQL: SELECT "title" FROM episode_data_12 WHERE "viewers_millions" = '3.7' AND "directed_by" = 'David Kendall'

Question: Who directed "People who use people"?
SQL: SELECT "directed_by" FROM episode_data_12 WHERE "title" = '"People Who Use People"'