SQL Update records with their occurance with a group

I have a t-SQL problem I can't get my head around.  I have a table of orders with each order having a unique alpha OrderNo.  Each order is associated with a BaseOrder in a many to one relation ship (one baseorder can have multiple orders).

The issue I have is I need to update the table and set a column to indicate the count of the order within the associated base order.  The example below indicates what I am after.  Orders 10001, 10012, 10018 and 1001A are all associated with BaseOrder 10001.  I need to update the SubOrderNumber with 1, 2, 3, 4 respectively as I want them stamped in incremental order based on their alpha sort order.


Example
canuckconsultingAsked:
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Haris DjulicConnect With a Mentor Commented:
Firts try if this select is ginivng you required output :


select orderno, baseorder,  ROW_NUMBER() OVER (PARTITION BY orderno, baseorder ORDER By orderno, baseorder) as SubOrderNumber 
from orders

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then try this:

UPDATE t
SET t.SubOrderNumber = t2.SubOrderNumber 
FROM order t
INNER JOIN (
select orderno, baseorder,  ROW_NUMBER() OVER (PARTITION BY orderno, baseorder ORDER By orderno, baseorder) as SubOrderNumber 
from orders
)t2
ON (t.OrderNo= t2.OrderNo and t.BaseOrder =t2.BaseOrder  )
WHERE conditions;

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canuckconsultingAuthor Commented:
Fabulous!  I had never heard of the over clause...what a handy tool!

Thanks,

Scott
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