What is the fewest total goals scored for players with under 171 league appearances, 151 total appearances, and the DF position?
CREATE TABLE "players_with_100_or_more_competitive_app" (
  "name" text,
  "position" text,
  "club_career" text,
  "league_apps" real,
  "league_goals" real,
  "total_apps" real,
  "total_goals" real
);
SELECT MIN("total_goals") FROM "players_with_100_or_more_competitive_app" WHERE "league_apps"<171 AND "total_apps"=151 AND "position"='df';