CREATE TABLE table_33830 ("Season" TEXT, "Episodes" FLOAT, "First airdate" TEXT, "Last airdate" TEXT, "Nielsen ranking" TEXT)

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_33830 WHERE "Episodes" < '24' AND "Nielsen ranking" = '#38'
SELECT "First airdate" FROM "table_33830" WHERE "Episodes" < '24' AND "Nielsen ranking" = '#38'