What is the sum of the ranks with a total of 1 and silver less than 0.
CREATE TABLE "medal_table" (
  "rank" real,
  "nation" text,
  "gold" real,
  "silver" real,
  "bronze" real,
  "total" real
);
SELECT SUM("rank") FROM "medal_table" WHERE "total"=1 AND "silver"<0;