CREATE TABLE table_name_21 (silver NUMBER, total VARCHAR2, gold VARCHAR2, rank VARCHAR2)

How many Silver medals did the Nation ranking 8 with more than 1 Total medal but less than 1 Gold receive?
SELECT SUM(silver) FROM table_name_21 WHERE gold < 1 AND rank = "8" AND total > 1
SELECT SUM("silver") FROM "table_name_21" WHERE "8" = "rank" AND "gold" < 1 AND "total" > 1