What is the sum of rank with more than 1 silver medal, 1 gold medal, and less than 6?
CREATE TABLE "performances_by_nation" (
  "rank" real,
  "gold" real,
  "silver" real,
  "bronze" real,
  "total" real
);
SELECT SUM("rank") FROM "performances_by_nation" WHERE "silver">1 AND "gold"=1 AND "total"<6;