Which Extra points is the highest one that has a Player of herman everhardus, and a Field goals larger than 0?
CREATE TABLE "scoring_leaders" (
  "player" text,
  "touchdowns" real,
  "extra_points" real,
  "field_goals" real,
  "points" real
);
SELECT MAX("extra_points") FROM "scoring_leaders" WHERE "player"='herman everhardus' AND "field_goals">0;