SELECT first_name, last_name FROM employees WHERE rownum = 1 ORDER BY creation_date DESC
You probably want to do this instead:
SELECT * from ( SELECT first_name, last_name FROM employees ORDER BY creation_date DESC ) where rownum = 1
The first query takes the first row returned by Oracle and orders it by creation_date.
The second query gets the first row of the sub-query that contains the sorted records.
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Written by Dorin Moise (Published articles: 264)