CREATE TABLE table_204_910 (id NUMBER, "rank" NUMBER, "name" CLOB, "nationality" CLOB, "result" NUMBER, "notes" CLOB)

what is the number of different nationalities represented by the top 5 athletes ?
SELECT COUNT(DISTINCT "nationality") FROM table_204_910 WHERE id <= 5
SELECT COUNT(DISTINCT "nationality") FROM "table_204_910" WHERE "id" <= 5