CREATE TABLE table_203_653 (id NUMBER, "rank" NUMBER, "nation" CLOB, "gold" NUMBER, "silver" NUMBER, "bronze" NUMBER, "total" NUMBER)

what country with more than 20 total medals has the least amount of silver medals ?
SELECT "nation" FROM table_203_653 WHERE "total" > 20 ORDER BY "silver" LIMIT 1
SELECT "nation" FROM "table_203_653" WHERE "total" > 20 ORDER BY "silver" FETCH FIRST 1 ROWS ONLY