Update col with rank

Dear all,
need to get serial number for each AID
AID      Needed Value
1      1
1      2
1      3
1      4
1      5
2      1
2      2
2      3
2      4
2      5
2      6
7      1
7      2
7      3
7      4
7      5
7      6
9      1
9      2
9      3
9      4
9      5
9      6

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select AID, ROW_NUMBER() over(partition by AID order by AID) as AIDROWNUMBER from @AIDTable

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Microsoft SQL Server

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