What's the sum of attendance when banbury united is the away team and tie no is over 102?
CREATE TABLE "ties" (
  "tie_no" real,
  "home_team" text,
  "score" text,
  "away_team" text,
  "attendance" real
);
SELECT SUM("attendance") FROM "ties" WHERE "away_team"='banbury united' AND "tie_no">102;