Finding orphans using SQL -- MIDRANGE-L

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All --

Is there a method in SQL that can be used to find "childless" header 
records? And this would include situations where the table has a 
multi-column index as it's primary index.

Example:

OrderHeader
-----------
Key Fields: CustomerNbr, OrderNbr



OrderDetail
-----------
Key Fields: CustomerNbr, OrderNbr, LineNbr



I want to find ALL the OrderHeader records that do NOT have any OrderDetail 
records. I'm drawing a blank right now.




Peace,

-- Don Schenck

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