CREATE TABLE table_name_90 (silver NUMBER, gold VARCHAR2, sport VARCHAR2, bronze VARCHAR2, total VARCHAR2)

What is the smallest number of silvers associated with bronzes under 20, totals of 1, golds of 0, and in Water Polo?
SELECT MIN(silver) FROM table_name_90 WHERE bronze < 20 AND total = 1 AND sport = "water polo" AND gold < 0
SELECT MIN("silver") FROM "table_name_90" WHERE "bronze" < 20 AND "gold" < 0 AND "sport" = "water polo" AND "total" = 1