What H/A had more than 15,000 in Attendance and Blackpool as Opponents?
CREATE TABLE "second_division" (
  "date" text,
  "opponents" text,
  "h_a" text,
  "result_f_a" text,
  "attendance" real
);
SELECT "h_a" FROM "second_division" WHERE "attendance">'15,000' AND "opponents"='blackpool';