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how to insert new record in my table if not exists sql server 2008

Last Modified: 2012-05-12
I want to insert a new record into my table if does not exist based on the TimeStamp field.  I have 2 tables, one is called InternalTable which has the following field:
TimeStamp                                   Status      TicketID
2011-07-27 13:44:09.000              Closed        124
2011-07-27 14:22:37.000              Closed        254
2012-01-01 15:11:57.000                Open        257

My 2nd table is called ExternalTable which has all the data that I need.  
TimeStamp                                   Status      TicketID
2011-07-27 13:44:09.000              Closed        124
2011-07-27 14:22:37.000              Closed        254
2012-01-01 15:11:57.000                Open        257
2012-01-10 15:11:57.000                Open        221
2012-01-11 15:11:57.000                Open        557

So I want only the new data to be inserted into the InternalTable from the ExternalTable.  If there is no new data is there (ExternalTable) then no record should be inserted. I think the key field here is the TimeStamp field because I get a new data every hour and I want to update the with the new data only based on the timestamp field.

Here is my current query (which does not do what I need)
Insert into dbo.InternalTable(TimeStamp, Status, TicketID)
Select * from dbo.ExternalTable
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