CREATE TABLE table_203_455 (id NUMBER, "round" NUMBER, "#" NUMBER, "player" CLOB, "nationality" CLOB, "college/junior/club team  ( league ) " CLOB)

which nationality has the least players ?
SELECT "nationality" FROM table_203_455 GROUP BY "nationality" ORDER BY COUNT("player") LIMIT 1
SELECT "nationality" FROM "table_203_455" GROUP BY "nationality" ORDER BY COUNT("player") FETCH FIRST 1 ROWS ONLY