How many house colours are associated with house names of Hillary?
CREATE TABLE "whanau_house_system" (
  "house_name" text,
  "house_mascot" text,
  "house_colour" text,
  "year_opened" real,
  "house_leader" text
);
SELECT COUNT("house_colour") FROM "whanau_house_system" WHERE "house_name"='Hillary';