Workaround for umlauts in column headers

As it seems, it’s not possible to use umlauts (ä, ö, ü or ß) in SQL queries in ONE DATA. Is there some way to work around this issue when your input data (uploaded CSV files) already contains umlauts as column header names (e.g. columns Straße, Kündigungsdatum, etc.), for example renaming it somehow in a very first processing step?

Or is it necessary to change the column header name before the upload?

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I just found out myself. With a Multiple Column Rename processor, it works like a charm.