Table: tv_episodes_7
Columns: series
season
title
directed_by
written_by
original_air_date
production_code
u_s_viewers_millions

Question: How many viewers, in millions, were for the episode directed by Tawnia McKiernan?
SQL: SELECT "u_s_viewers_millions" FROM tv_episodes_7 WHERE "directed_by" = 'Tawnia McKiernan'

Question: How many episodes were written only by William N. Fordes?
SQL: SELECT COUNT("series") FROM tv_episodes_7 WHERE "written_by" = 'William N. Fordes'

Question: How many U.S Viewers, in millions, were for series # 26?
SQL: SELECT "u_s_viewers_millions" FROM tv_episodes_7 WHERE "series" = 26