What was the average number of "goals for", scored in the club Real Oviedo that had a "goal difference" lower than -16 and fewer than 9 wins?
CREATE TABLE "final_table" (
  "position" real,
  "club" text,
  "played" real,
  "points" text,
  "wins" real,
  "draws" real,
  "losses" real,
  "goals_for" real,
  "goals_against" real,
  "goal_difference" real
);
SELECT AVG("goals_for") FROM "final_table" WHERE "goal_difference"<-16 AND "club"='real oviedo' AND "wins"<9;