What is the average value for Gold, when the value for Silver is greater than 2, and when the Nation is West Germany?
CREATE TABLE "medal_table" (
  "rank" text,
  "nation" text,
  "gold" real,
  "silver" real,
  "bronze" real,
  "total" real
);
SELECT AVG("gold") FROM "medal_table" WHERE "silver">2 AND "nation"='west germany';