What in Xenia's Diameter in km, with a latitude of 14 and a longitude of 249.4?
CREATE TABLE "x" (
  "name" text,
  "latitude" real,
  "longitude" real,
  "diameter_km" real,
  "named_after" text
);
SELECT COUNT("diameter_km") FROM "x" WHERE "latitude"<14 AND "name"='xenia' AND "longitude">249.4;