What's the green (SW) of the model with charcoal/white interior/roof?
CREATE TABLE "convertible" (
  "interior_roof" text,
  "black_ua" real,
  "red_e8" real,
  "white_zr" real,
  "green_sw" real,
  "totals" real
);
SELECT MIN("green_sw") FROM "convertible" WHERE "interior_roof"='Charcoal/white';