Daniela Ryf who competes in the women's even had what swim (1.5km)?
CREATE TABLE "triathlon" (
  "athlete" text,
  "event" text,
  "swim_1_5km" text,
  "trans_1" text,
  "bike_40km" text,
  "trans_2" text,
  "run_10km" text,
  "total_time" text,
  "rank" real
);
SELECT "swim_1_5km" FROM "triathlon" WHERE "event"='women''s' AND "athlete"='daniela ryf';