CREATE TABLE table_75514 ("Rank" TEXT, "Nation" TEXT, "Gold" FLOAT, "Silver" FLOAT, "Bronze" FLOAT, "Total" FLOAT)

What's the biggest Bronze that has less than 0 Silvers?
SELECT MAX("Bronze") FROM table_75514 WHERE "Silver" < '0'
SELECT MAX("Bronze") FROM "table_75514" WHERE "Silver" < '0'