Table: tv_episode_ratings_10
Columns: no_in_series
no_in_season
title
original_air_date
production_code
u_s_viewers_millions

Question: What was the airdate of the episode of production code 214?
SQL: SELECT "original_air_date" FROM tv_episode_ratings_10 WHERE "production_code" = 214

Question: How many numbers in the season have an air date of June 3, 2012?
SQL: SELECT COUNT("no_in_season") FROM tv_episode_ratings_10 WHERE "original_air_date" = 'June 3, 2012'

Question: What is the highest production code of the episodes having a US viewership of exactly 2.3?
SQL: SELECT MAX("production_code") FROM tv_episode_ratings_10 WHERE "u_s_viewers_millions" = '2.3'

Question: How many millions of US viewers watched the episode titled "Happy Howl-o-ween"?
SQL: SELECT "u_s_viewers_millions" FROM tv_episode_ratings_10 WHERE "title" = '"Happy Howl-O-Ween"'