Who was the winner of Stage 12 with a Points Classification of Francesco Moser?
CREATE TABLE "classification_leadership_by_stage" (
  "stage" text,
  "winner" text,
  "general_classification" text,
  "points_classification" text,
  "trofeo_fast_team" text
);
SELECT "winner" FROM "classification_leadership_by_stage" WHERE "points_classification"='francesco moser' AND "stage"='12';