Which Tries for has Points against larger than 87, and Tries against smaller than 28, and Points diff of +63?
CREATE TABLE "pool_3" (
  "team" text,
  "tries_for" real,
  "tries_against" real,
  "try_diff" text,
  "points_for" real,
  "points_against" real,
  "points_diff" text
);
SELECT AVG("tries_for") FROM "pool_3" WHERE "points_against">87 AND "tries_against"<28 AND "points_diff"='+63';