What is the sum of Gold with Participants that are 4 and a Silver that is smaller than 0?
CREATE TABLE "medal_tally" (
  "rank" real,
  "gold" real,
  "silver" real,
  "bronze" real,
  "total" real,
  "participants" real
);
SELECT SUM("gold") FROM "medal_tally" WHERE "participants"=4 AND "silver"<0;