CREATE TABLE "episodes" (
  "children_of_earth" text,
  "run_time" text,
  "writer" text,
  "director" text,
  "original_airdate" text,
  "viewers_including_hd_in_millions" text
);

Question: Who is the writer of Children of Earth of "day four"?
SQL: SELECT "writer" FROM "episodes" WHERE "children_of_earth"='\"day four\"';

Question: How many viewers were there for Children of Earth of "day one"?
SQL: SELECT "viewers_including_hd_in_millions" FROM "episodes" WHERE "children_of_earth"='\"day one\"';

Question: Who was the director of Children of Earth of "day five"?
SQL: SELECT "director" FROM "episodes" WHERE "children_of_earth"='\"day five\"';

Question: Who was the director of the episode written by Russell T Davies and James Moran?
SQL: SELECT "director" FROM "episodes" WHERE "writer"='russell t davies and james moran';