What is the lowest number conceded for the team that had less than 8 wins, scored 21, and had less than 23 points?
CREATE TABLE "torneo_apertura" (
  "position" real,
  "team" text,
  "played" real,
  "wins" real,
  "draws" real,
  "losses" real,
  "scored" real,
  "conceded" real,
  "points" real
);
SELECT MIN("conceded") FROM "torneo_apertura" WHERE "wins"<8 AND "scored"=21 AND "points"<23;