nice example 
Here is another :
WITH
cteEmployeeOrderedByMyRowNumber AS
(SELECT ROW_NUMBER() OVER (ORDER BY EMPID ASC, REFDATE ASC) AS MyRowNumber
, Row_NUMBER() Over (Partition By EMPID,FNAME,LNAME Order By REFDATE ASC) as PartitionRank
, *
FROM EMPLOYEE
-- WHERE 1 = 1
)
DELETE FROM cteEmployeeOrderedByMyRowNumber
where PartitionRank > 1 ;
just to get it in the tips of the fingers 
Johan
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