CREATE TABLE table_203_824 (id DECIMAL, "pick #" DECIMAL, "player" TEXT, "position" TEXT, "nationality" TEXT, "nhl team" TEXT, "college/junior/club team" TEXT)

the most players picked came from which nationality ?
SELECT "nationality" FROM table_203_824 GROUP BY "nationality" ORDER BY COUNT("player") DESC LIMIT 1
SELECT "nationality" FROM "table_203_824" GROUP BY "nationality" ORDER BY COUNT("player") DESC NULLS LAST LIMIT 1