CREATE TABLE table_56924 ("Rank" FLOAT, "Nation" TEXT, "Gold" FLOAT, "Silver" FLOAT, "Bronze" FLOAT, "Total" FLOAT)

what is the lowest amount of silver when the gold is less than 0?
SELECT MIN("Silver") FROM table_56924 WHERE "Gold" < '0'
SELECT MIN("Silver") FROM "table_56924" WHERE "Gold" < '0'