We had the same issue. Usually we use coalesce to merge German and English into one field.
Based on your query you could do the following:
|alter Domain_Name = coalesce (Domain_Name_GER, Domain_Name_ENG)
Coalesce takes the first value which is not NULL. But usually only GER or ENG has a value and not both.
Hope this helps. If you find a better solution I'm interested how you solved it.
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