What is the Set 1 when Set 3 was 25–15?
CREATE TABLE "pool_c" (
  "date" text,
  "score" text,
  "set_1" text,
  "set_2" text,
  "set_3" text,
  "total" text
);
SELECT "set_1" FROM "pool_c" WHERE "set_3"='25–15';