Which Date has a Set 1 of 25–20?
CREATE TABLE "pool_f" (
  "date" text,
  "time" text,
  "score" text,
  "set_1" text,
  "set_2" text,
  "set_3" text,
  "total" text
);
SELECT "date" FROM "pool_f" WHERE "set_1"='25–20';