what is the average league cup goals when the position is df and total goals is more than 4?
CREATE TABLE "appearances_and_goals" (
  "name" text,
  "position" text,
  "league_apps" text,
  "league_goals" real,
  "fa_cup_apps" text,
  "fa_cup_goals" real,
  "league_cup_apps" real,
  "league_cup_goals" real,
  "total_apps" text,
  "total_goals" real
);
SELECT AVG("league_cup_goals") FROM "appearances_and_goals" WHERE "position"='df' AND "total_goals">4;