What was Donald Bradman's average runs?
CREATE TABLE "best_batting_averages" (
  "player" text,
  "team" text,
  "matches" real,
  "innings" real,
  "runs" real,
  "average" real,
  "highest_score" text,
  "100s" real
);
SELECT AVG("runs") FROM "best_batting_averages" WHERE "player"='donald bradman';