insert join set where

I tried to make an insert query that adds all the values of a dummy table which are not yet in the main dbI tried this:INSERT INTO artikelen (PartNrFabrikant, omschrijving, verkoopprijs, EAN)SELECT (PartNrFabrikant, omschrijving, verkoopprijs, EAN) FROM artikelenINNER JOIN [Hofstede].[dbo].[SparePartsUpdate] SPSET [toegevoegd] = getDate()WHERE a.[PartNrFabrikant] not in sp.[PartNrFabrikant]but that is never going to work :pwhat should I change?