CREATE TABLE table_name_68 (first_airdate VARCHAR, episodes VARCHAR, nielsen_ranking VARCHAR)

What was the first airdate or the season that had less than 24 episodes and a Nielsen ranking of #38?
SELECT first_airdate FROM table_name_68 WHERE episodes < 24 AND nielsen_ranking = "#38"
SELECT "first_airdate" FROM "table_name_68" WHERE "#38" = "nielsen_ranking" AND "episodes" < 24