what is the amount of silver when gold is 2 and the rank is more than 1?
CREATE TABLE "medal_table" (
  "rank" real,
  "nation" text,
  "gold" real,
  "silver" real,
  "bronze" real,
  "total" real
);
SELECT AVG("silver") FROM "medal_table" WHERE "gold"=2 AND "rank">1;