Which Polish Cup has a Puchat Ligi larger than 0?
CREATE TABLE "top_scorers" (
  "player" text,
  "position" text,
  "ekstraklasa" real,
  "polish_cup" real,
  "puchat_ligi" real,
  "uefa_cup" real,
  "total" real
);
SELECT AVG("polish_cup") FROM "top_scorers" WHERE "puchat_ligi">0;