What's the average bronze with a total number of medals being 1, with more than 0 silvers?
CREATE TABLE "medal_table" (
  "rank" text,
  "nation" text,
  "gold" real,
  "silver" real,
  "bronze" real,
  "total" real
);
SELECT AVG("bronze") FROM "medal_table" WHERE "total"=1 AND "silver">0;