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
);

Question: D'Oyly Carte 1920 Tour of hugh enes blackmore is what D'Oyly Carte 1930 Tour?
SQL: SELECT "d_oyly_carte_1930_tour" FROM "historical_casting" WHERE "d_oyly_carte_1920_tour"='hugh enes blackmore';

Question: D'Oyly Carte 1939 Tour of richard walker involves what D'Oyly Carte 1945 Tour?
SQL: SELECT "d_oyly_carte_1945_tour" FROM "historical_casting" WHERE "d_oyly_carte_1939_tour"='richard walker';

Question: D'Oyly Carte 1920 Tour of james turnbull is what D'Oyly Carte 1945 Tour?
SQL: SELECT "d_oyly_carte_1945_tour" FROM "historical_casting" WHERE "d_oyly_carte_1920_tour"='james turnbull';

Question: Role of wilfred is what D'Oyly Carte 1945 Tour?
SQL: SELECT "d_oyly_carte_1945_tour" FROM "historical_casting" WHERE "role"='wilfred';

Question: D'Oyly Carte 1939 Tour of sydney granville had what D'Oyly Carte 1950 Tour
SQL: SELECT "d_oyly_carte_1950_tour" FROM "historical_casting" WHERE "d_oyly_carte_1939_tour"='sydney granville';

Question: D'Oyly Carte 1930 Tour of john dean involved what D'Oyly Carte 1945 Tour?
SQL: SELECT "d_oyly_carte_1945_tour" FROM "historical_casting" WHERE "d_oyly_carte_1930_tour"='john dean';