CREATE TABLE "series_1" (
  "episode" real,
  "title" text,
  "story" text,
  "adapted_by" text,
  "director" text,
  "airdate" text,
  "exists" text
);

Question: What is the airdate when the director is george spenton-foster
SQL: SELECT "airdate" FROM "series_1" WHERE "director"='George Spenton-Foster';

Question: Name the msot episode that was adapted by leon griffiths
SQL: SELECT MAX("episode") FROM "series_1" WHERE "adapted_by"='Leon Griffiths';

Question: Name the number of episodes for alan nourse
SQL: SELECT COUNT("episode") FROM "series_1" WHERE "story"='Alan Nourse';