CREATE TABLE table_204_893 (id NUMBER, "rank" NUMBER, "name" CLOB, "nationality" CLOB, "time" CLOB, "notes" CLOB)

which country had the most athletes ?
SELECT "nationality" FROM table_204_893 GROUP BY "nationality" ORDER BY COUNT("name") DESC LIMIT 1
SELECT "nationality" FROM "table_204_893" GROUP BY "nationality" ORDER BY COUNT("name") DESC FETCH FIRST 1 ROWS ONLY