What is the most wins for a position with more than 30 played and a goal difference of 11?
CREATE TABLE "group_i" (
  "position" real,
  "played" real,
  "points" real,
  "wins" real,
  "draws" real,
  "losses" real,
  "goals_for" real,
  "goals_against" real,
  "goal_difference" real
);
SELECT MAX("wins") FROM "group_i" WHERE "goal_difference"=11 AND "played">30;