What is the lowest Bronze that has a Total larger than 18 and a Silver smaller than 143?
CREATE TABLE "asian_games" (
  "sport" text,
  "gold" real,
  "silver" real,
  "bronze" real,
  "total" real
);
SELECT MIN("bronze") FROM "asian_games" WHERE "total">18 AND "sport"='total' AND "silver"<143;