What are the average apps for the Major League Soccer team club for the Seattle Sounders FC that has goals less than 0?
CREATE TABLE "statistics" (
  "season" text,
  "club" text,
  "league" text,
  "apps" real,
  "goals" real
);
SELECT AVG("apps") FROM "statistics" WHERE "league"='major league soccer' AND "club"='seattle sounders fc' AND "goals"<0;