CREATE TABLE "table1_2370579_1" (
  "episode_num" real,
  "prod_num" real,
  "title" text,
  "directed_by" text,
  "written_by" text,
  "originalairdate" text,
  "filmed" text
);

Question: What date did the episode "the killing (part two)" originally air?
SQL: SELECT "originalairdate" FROM "table1_2370579_1" 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 "table1_2370579_1" WHERE "written_by"='Tony O''Grady (pseudonym of Brian Clemens)';

Question: What is the production number for episode 23?
SQL: SELECT MIN("prod_num") FROM "table1_2370579_1" WHERE "episode_num"=23;

Question: What month and year was "storm warning (part one)" filmed?
SQL: SELECT "filmed" FROM "table1_2370579_1" WHERE "title"='\"Storm Warning (part one)\"';