update query

I am again having problems with these damned commas, they seem never to conform to my knowledge.I tried to convert the otherwise good and working update query into an sql but i got red colours showing that Access does not accept my commas.I tried with single commas ' or with double commas """" but obviously i jumbled the commas up with no result.Would you help me convert the update query below into an sql ?

UPDATE products SET products.items5 = DLookUp("Diff","qryNetDiff","ProductID=" & [ProductID])
WHERE (((products.Productid) In (SELECT ProductID FROM qryNetDiff)));
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