learn using alaises rather than repeating long table names everywhere
Update a
Set a.[Birth Place] = g.GeboorteplaatsPCD
from dbo.[Abrona Productie$SoCM Client] a
join GnGeboorteplaatsenOver g
on a.Code = g.Code
WHERE a.[Birth Place]=''
hope you dont want to check for NULLs in [Birth Place] field or you've to include that too in WHERE
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SQL Server MVP
http://visakhm.blogspot.com/