What is the try bonus when there are 492 points?
CREATE TABLE "league_table" (
  "club" text,
  "played" text,
  "drawn" text,
  "lost" text,
  "points_for" text,
  "points_against" text,
  "tries_for" text,
  "tries_against" text,
  "try_bonus" text
);
SELECT "try_bonus" FROM "league_table" WHERE "points_against"='492';