Table: tv_episode_12
Columns: series
title
directed_by
written_by
original_air_date
prod_code

Question: What is the original air date of the episode with a production code of 105? 
SQL: SELECT "original_air_date" FROM tv_episode_12 WHERE "prod_code" = 105

Question: What is the original air date of the episode titled "Pilot"?
SQL: SELECT "original_air_date" FROM tv_episode_12 WHERE "title" = '"Pilot"'

Question: Who wrote the episode titled "Christmas"? 
SQL: SELECT "written_by" FROM tv_episode_12 WHERE "title" = '"Christmas"'

Question: What is the production code of the episode titled "Lenny"?
SQL: SELECT MAX("prod_code") FROM tv_episode_12 WHERE "title" = '"Lenny"'

Question: What is the original air date of the episode titled "Mom at the Bar/Train Buddy" that was written b Adrienne Carter? 
SQL: SELECT "original_air_date" FROM tv_episode_12 WHERE "written_by" = 'Adrienne Carter' AND "title" = '"Mom at the Bar/Train Buddy"'

Question: What is the original air date of the episode titled "Commercial/Coach DMV"? 
SQL: SELECT "original_air_date" FROM tv_episode_12 WHERE "title" = '"Commercial/Coach DMV"'