Which Height (m) has a Name of plessur alps, and a AVE-No larger than 63?
CREATE TABLE "alpine_club_classification" (
  "ave_no" real,
  "name" text,
  "country" text,
  "highest_mountain" text,
  "height_m" real
);
SELECT MIN("height_m") FROM "alpine_club_classification" WHERE "name"='plessur alps' AND "ave_no">63;