How many different total results are there for the model with parchment/black interior/roof?
CREATE TABLE "convertible" (
  "interior_roof" text,
  "black_ua" real,
  "red_e8" real,
  "white_zr" real,
  "green_sw" real,
  "totals" real
);
SELECT COUNT("totals") FROM "convertible" WHERE "interior_roof"='Parchment/black';