What is the average FA Cup Goal value for players that have 0 Other goals, 0 FL Cup goals, and fewer than 39 League goals?
CREATE TABLE "goals" (
  "name" text,
  "league_goals" real,
  "fa_cup_goals" real,
  "fl_cup_goals" real,
  "other_goals" real,
  "total" real,
  "career" text
);
SELECT AVG("fa_cup_goals") FROM "goals" WHERE "other_goals"=0 AND "fl_cup_goals"=0 AND "league_goals"<39;