What is the first locomotive that has a SLM number lower than 924?
CREATE TABLE "united_kingdom" (
  "built" real,
  "number" real,
  "type" text,
  "slm_number" real,
  "wheel_arrangement" text,
  "location" text,
  "notes" text
);
SELECT MIN("number") FROM "united_kingdom" WHERE "slm_number"<924;