Table: episodes_db_2
Columns: no_in_series
title
directed_by
written_by
original_air_date
production_code

Question: Who directed all the episodes that were written by aaron ehasz & john o'bryan?
SQL: SELECT "directed_by" FROM episodes_db_2 WHERE "written_by" = 'Aaron Ehasz & John O''Bryan'

Question: What was the production code of the episode that was written by michael dante dimartino and directed by lauren macmullan?
SQL: SELECT "production_code" FROM episodes_db_2 WHERE "written_by" = 'Michael Dante DiMartino' AND "directed_by" = 'Lauren MacMullan'

Question: What was the airdate of the episode that was directed by giancarlo volpe and written by is john o'bryan?
SQL: SELECT "original_air_date" FROM episodes_db_2 WHERE "directed_by" = 'Giancarlo Volpe' AND "written_by" = 'John O''Bryan'