What is the distance for the unnamed race with 3 runners at Newcastle?
CREATE TABLE "summary" (
  "race_name" text,
  "dist_miles" text,
  "course" text,
  "prize" text,
  "jockey" text,
  "odds" text,
  "runners" text
);
SELECT "dist_miles" FROM "summary" WHERE "race_name"='unnamed race' AND "runners"='3' AND "course"='newcastle';