What is the average number of Gold when the total is 11 with more than 2 silver?
CREATE TABLE "medal_table" (
  "rank" real,
  "nation" text,
  "gold" real,
  "silver" real,
  "bronze" real,
  "total" real
);
SELECT AVG("gold") FROM "medal_table" WHERE "total"=11 AND "silver">2;