What is the average Gold where the Nation is Russia (rus) and the number of silver is less than 2?
CREATE TABLE "medal_table" (
  "rank" real,
  "nation" text,
  "gold" real,
  "silver" real,
  "bronze" real,
  "total" real
);
SELECT AVG("gold") FROM "medal_table" WHERE "nation"='russia (rus)' AND "silver"<2;