Table: tv_episode_18
Columns: series
title
directed_by
written_by
original_air_date
production_code

Question: Name the least series number written by brenda hampton and directed by  burt brinckerhoff
SQL: SELECT MIN("series") FROM tv_episode_18 WHERE "written_by" = 'Brenda Hampton' AND "directed_by" = 'Burt Brinckerhoff'

Question: Name the original air date for series number 15
SQL: SELECT "original_air_date" FROM tv_episode_18 WHERE "series" = 15