Table: tv_episode_data_30
Columns: no_in_series
no_in_season
title
directed_by
written_by
original_air_date
u_s_viewers_in_millions

Question: How many millions of people watched the episode "The Grandfather"?
SQL: SELECT "u_s_viewers_in_millions" FROM tv_episode_data_30 WHERE "title" = '"The Grandfather"'

Question: How many people wrote the episode with 3.40 million U.S viewers?
SQL: SELECT COUNT("written_by") FROM tv_episode_data_30 WHERE "u_s_viewers_in_millions" = '3.40'