Table: episode_details_6
Columns: episode
prod
title
directed_by
written_by
originalairdate
filmed

Question: What date did the episode "the killing (part two)" originally air?
SQL: SELECT "originalairdate" FROM episode_details_6 WHERE "title" = '"The Killing (part two)"'

Question: Who directed the episode written by Tony O'Grady (pseudonym of brian clemens)?
SQL: SELECT "directed_by" FROM episode_details_6 WHERE "written_by" = 'Tony O''Grady (pseudonym of Brian Clemens)'

Question: What is the production number for episode 23?
SQL: SELECT MIN("prod") FROM episode_details_6 WHERE "episode" = 23

Question: What month and year was "storm warning (part one)" filmed?
SQL: SELECT "filmed" FROM episode_details_6 WHERE "title" = '"Storm Warning (part one)"'