What is the average number of goals with 21 games for a debut round less than 1?
CREATE TABLE "players_who_made_their_club_debut_during" (
  "name" text,
  "club" text,
  "debut_round" real,
  "games_2008" real,
  "goals_2008" real,
  "previous_club_s" text
);
SELECT AVG("goals_2008") FROM "players_who_made_their_club_debut_during" WHERE "games_2008"=21 AND "debut_round"<1;