Feature in SQL Server to Update Field with Sort Numbers

Without having to open a cursor and update one record at a time, is there a feature in SQL Server 2012 that I can use to assign a sort number to each Qty for the same Id as follows:
Id         Qty        SortNo
1           20          1
1           50          2
1           100        3
2           10          1
2           70          2
etc.

Note: The table would start out with blank SortNo data and the code of the stored procedure would update the SortNo of each record.
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Declan_BasileITAsked:
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Olaf DoschkeSoftware DeveloperCommented:
In the simplest case don't store it at all, such a sorting and numbering can be achieved on the fly in a query with OVER clause:

Declare @test as Table (Id int, Qty  int)

Insert Into @test Values (1,50),(1,20),(1,100),(2,70),(2,10)

Select *, ROW_NUMBER() OVER (Partition By Id Order By Qty) as SortNo
From @test 
Order By Id, Qty

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Partiton means reset of row numbering to 1, Partition by Id means reset to 1 for each Id value, and the order determines order of numbering, of course.

The whole concept is working very optimized. Let me go out on a limb and state this is computed faster than reading it from a stored SortNo column. The only advantage in a stored sortno is, you may override the automatic sorting, you may use it for a case like comparing last week/month/quarter/year sorting with current computed sorting and more.

So if you like, you may take the result as basis of populating a SortNo column.

Bye, Olaf.
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awking00Commented:
If you really need to have the sortno column updated, you can combine Olaf Doschke's query with a merge operation -
merge into yourtable t
using
(select id, qty, row_number() over (partition by id order by qty) as sortno
 from yourtable) x
on (t.id = x.id and t.qty = x.qty)
when matched then
update set
s.tortno = x.sortno;
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Declan_BasileITAuthor Commented:
Thank you both.  I ended up using this Statement (Note: the actual table is a bit more complicated than the one I used to demonstrate the question)

      UPDATE B SET B.Int1 = Q.SortNo FROM TableB AS B INNER JOIN
      (SELECT T.PK1Id, T.Float1, ROW_NUMBER() OVER (Partition By PK1Id Order By Float1) As SortNo
      FROM TableB T WHERE T.ProgramSessionId = @ProgramSessionId) AS Q ON B.PK1Id = Q.PK1Id AND B.Float1 = Q.Float1
      WHERE B.ProgramSessionId = @ProgramSessionId;
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