CREATE TABLE table_204_547 (id NUMBER, "rank" NUMBER, "lane" NUMBER, "name" CLOB, "nationality" CLOB, "time" NUMBER, "notes" CLOB)

which country came in last ?
SELECT "nationality" FROM table_204_547 ORDER BY "rank" DESC LIMIT 1
SELECT "nationality" FROM "table_204_547" ORDER BY "rank" DESC FETCH FIRST 1 ROWS ONLY