D'Oyly Carte 1920 Tour of james turnbull is what D'Oyly Carte 1945 Tour?
CREATE TABLE "historical_casting" (
  "role" text,
  "d_oyly_carte_1920_tour" text,
  "d_oyly_carte_1930_tour" text,
  "d_oyly_carte_1939_tour" text,
  "d_oyly_carte_1945_tour" text,
  "d_oyly_carte_1950_tour" text
);
SELECT "d_oyly_carte_1945_tour" FROM "historical_casting" WHERE "d_oyly_carte_1920_tour"='james turnbull';