Identify and select records that were just inserted

I'm trying to find out the best way to identify the records that were just inserted and select data fields from those records using a stored procedure.
The task is to retrieve certain fields from the entries that were inserted in bulk from a flat file.
To base it on creation date could be an issue as this could be an overnight process and dates will not match. Should I add a flag field that gets set for an insert and reset when its processed.
Or is there a way using cursors or identity I could achieve this.  Please let me know your ideas. Thank You
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Aneesh RetnakaranDatabase AdministratorCommented:

DECLARE @tab TABLE (id int)
OUTPUT INTO @tab(id ) --now @tab conatin the newly inserted ids
SELECT col1 ,col2
FROM someTable
darthvader747Author Commented:
The records are inserted in a different method. Could you please explain your solution in this context. Thank You
>> Should I add a flag field that gets set for an insert and reset when its processed.
That is by far the simplest efficient approach.  Flags (bit) are not optimised and cannot be indexed nicely.
Instead, add a datetime field to the table default getdate() that is not supplied by the flat file import.
Add an index to it too.
Clear the datetime field once processed, which also keeps the index small (nulls are never indexed).

You could use an identity column, but that means you need to keep track of the last identity processed from the last batch each time.

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Anthony PerkinsCommented:
I would recommend you use the OUTPUT clause as suggested by Aneesh.  The big advantage is that you do not have make any schema changes.
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Microsoft SQL Server 2005

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