Name the won for played being 22 and points against 511 and lost being 15
CREATE TABLE "wru_division_one_east" (
  "club" text,
  "played" text,
  "won" text,
  "drawn" text,
  "lost" text,
  "points_for" text,
  "points_against" text,
  "tries_for" text,
  "points" text
);
SELECT "won" FROM "wru_division_one_east" WHERE "played"='22' AND "lost"='15' AND "points_against"='511';