What is the average first prize of the tournament with a score of 279 (–9)?
CREATE TABLE "tournament_results" (
  "date" text,
  "tournament" text,
  "location" text,
  "winner" text,
  "score" text,
  "1st_prize" real
);
SELECT AVG("1st_prize") FROM "tournament_results" WHERE "score"='279 (–9)';