Table: tv_episodes_20
Columns: season_no
title
directed_by
written_by
original_air_date
production_code
u_s_viewers_millions

Question: What was the season number for production code E2110?
SQL: SELECT "season_no" FROM tv_episodes_20 WHERE "production_code" = 'E2110'

Question: What was the original air date for season number 2?
SQL: SELECT "original_air_date" FROM tv_episodes_20 WHERE "season_no" = 2

Question: What was the season number episode directed by John David Coles?
SQL: SELECT "season_no" FROM tv_episodes_20 WHERE "directed_by" = 'John David Coles'

Question: What was the number of US Viewers in the episode directed by Steve Shill and having a production code of E2102?
SQL: SELECT "u_s_viewers_millions" FROM tv_episodes_20 WHERE "directed_by" = 'Steve Shill' AND "production_code" = 'E2102'

Question: What was the number of season number entries that had US Viewers of 12.30 million?
SQL: SELECT COUNT("season_no") FROM tv_episodes_20 WHERE "u_s_viewers_millions" = '12.30'