What day was there a set 1 of 25-18?
CREATE TABLE "pool_a" (
  "game" real,
  "date" text,
  "set_1" text,
  "set_2" text,
  "set_3" text,
  "set_4" text,
  "set_5" text,
  "result_sets" text,
  "result_pts" text
);
SELECT "date" FROM "pool_a" WHERE "set_1"='25-18';