What is the goal top with caps of 38 and an average less than 0.579?
CREATE TABLE "highest_goalscorers" (
  "name" text,
  "scotland_career" text,
  "caps" real,
  "goals" real,
  "average" real
);
SELECT MAX("goals") FROM "highest_goalscorers" WHERE "caps"=38 AND "average"<0.579;