Need help eliminating duplicates and keeping the last record

Need a SQL statement that eliminates duplicates and chooses the last record entered.

Ex. WO1002421 has two entries. I want to keep the record of the last person Wilmer Tamayo-Sanchez.

This statement below is what I am using but as unfortunately, it still brings in duplicates.  
SELECT MAX(WO_NUMBER) as wo_number
	  having count(*)>1

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SELECT wo_number, first_name, last_name
    FROM (SELECT wo_number,
                 ROW_NUMBER() OVER(PARTITION BY wo_number ORDER BY first_name, last_name) rn,
                 COUNT(*) OVER (PARTITION BY wo_number) cnt
            FROM ba_view_wo_labor
           WHERE skill NOT LIKE '%INSPECTOR')
   WHERE cnt > 1 AND rn = 1
ORDER BY wo_number

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johnsoneSenior Oracle DBACommented:
How do you define "last one"?  Typically, there is a date field or something like that to order by to determine which one is first or last.
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