CREATE TABLE "medal_table" (
  "rank" real,
  "nation" text,
  "gold" real,
  "silver" real,
  "bronze" real,
  "total" real
);

Question: What is the total amount of Gold from guatemala and silver smaller than 0?
SQL: SELECT SUM("gold") FROM "medal_table" WHERE "nation"='guatemala' AND "silver"<0;