CREATE TABLE table_204_174 (id NUMBER, "rank" NUMBER, "name" CLOB, "nationality" CLOB, "result" NUMBER, "notes" CLOB)

how many nationalities are there after rank 5 ?
SELECT COUNT(DISTINCT "nationality") FROM table_204_174 WHERE "rank" > 5
SELECT COUNT(DISTINCT "nationality") FROM "table_204_174" WHERE "rank" > 5