If the games played are smaller than 18, what are the lowest goals conceded?
CREATE TABLE "league_standings" (
  "place" real,
  "team" text,
  "played" real,
  "draw" real,
  "lost" real,
  "goals_scored" real,
  "goals_conceded" real,
  "points" real
);
SELECT MIN("goals_conceded") FROM "league_standings" WHERE "played"<18;