If the place is smaller than 8 and they played more than 18, what is the total number of 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 COUNT("goals_conceded") FROM "league_standings" WHERE "place"<8 AND "played">18;