How much Total has a Rank smaller than 10, and a Silver larger than 3, and a Gold larger than 3?
CREATE TABLE "performances_by_nation" (
  "rank" real,
  "gold" real,
  "silver" real,
  "bronze" real,
  "total" real
);
SELECT SUM("total") FROM "performances_by_nation" WHERE "rank"<10 AND "silver">3 AND "gold">3;