CREATE TABLE table_name_19 (silver NUMBER, bronze VARCHAR2, gold VARCHAR2, total VARCHAR2)

Gold of 1, and a Total smaller than 4, and a Bronze smaller than 0 has the lowest silver?
SELECT MIN(silver) FROM table_name_19 WHERE gold = 1 AND total < 4 AND bronze < 0
SELECT MIN("silver") FROM "table_name_19" WHERE "bronze" < 0 AND "gold" = 1 AND "total" < 4