What is the sum of FA Cup goals when there are 19 league goals?
CREATE TABLE "third_division" (
  "scorer" text,
  "club" text,
  "league_goals" text,
  "fa_cup_goals" real,
  "league_cup_goals" text,
  "total" real
);
SELECT SUM("fa_cup_goals") FROM "third_division" WHERE "league_goals"='19';