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SqlServer SQL Statement Where compare two fields from different tables and on is null

BFanguy
BFanguy asked
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Last Modified: 2012-05-10
Both of these sql statements work fine as long as both tables have values in both fields:
where R.DRAWING_ID <> P.DRAWING_ID

where NOT R.DRAWING_ID = P.DRAWING_ID

But if either one contains a null it does not fire - what do i need to do to get the records where one of the fields is null
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