Row_number(), dense Rank rank etc

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You need SQL 2005 or greater for this:
Rownumbers with partitions:

SELECT 
    s.gppraccode
    ,age
    ,ROW_NUMBER()OVER (PARTITION BY gppraccode ORDER BY age asc) As [RowNumber]
FROM mgw_ane_base AS s 

SELECT s.gppraccode, age
    ,ROW_NUMBER() OVER (ORDER BY age) AS "RowNumber"
    ,RANK() OVER (ORDER BY age) AS Rank
    ,DENSE_RANK() OVER (ORDER BY age) AS "DenseRank"
    ,NTILE(10) OVER (ORDER BY age) AS Quartile
INTO ##mgw
FROM mgw_ane_base AS s

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