CREATE TABLE table_203_61 (id NUMBER, "rank" NUMBER, "nation" CLOB, "gold" NUMBER, "silver" NUMBER, "bronze" NUMBER, "total" NUMBER)

which african country had 8 silver medal wins , but no gold medals ?
SELECT "nation" FROM table_203_61 WHERE "silver" = 8 AND "gold" = 0
SELECT "nation" FROM "table_203_61" WHERE "gold" = 0 AND "silver" = 8