What is the Piano di Sorrento, Napoli lowest km2 with a total smaller than 121.14 km2?
CREATE TABLE "municipalities" (
  "province" text,
  "comune" text,
  "population_inh" real,
  "area_km" real,
  "total_km" real
);
SELECT MIN("area_km") FROM "municipalities" WHERE "province"='napoli' AND "comune"='piano di sorrento' AND "total_km"<121.14;