Table: tv_episodes
Columns: no_in_series
no_in_season
title
directed_by
written_by
featured_character_s
original_air_date
u_s_viewers_million

Question: What is the title when original air date is may15,2008?
SQL: SELECT "title" FROM tv_episodes WHERE "original_air_date" = 'May15,2008'

Question: What is the highest no. in season?
SQL: SELECT MAX("no_in_season") FROM tv_episodes

Question: Who directed the episode where u.s. viewers (million) is 12.90?
SQL: SELECT "directed_by" FROM tv_episodes WHERE "u_s_viewers_million" = '12.90'