Change Column Type By Position in Power Query
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Power Query で列名を一括変換する
Forget the Hard-Coded Column Names - Change Data Type To All Columns In a Table
Change Column Data Type Power Query Editor Power BI
How to Change Data Type in Power Query Editor MS Excel 2016
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Quickly change data types with M language in Power Query
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Change Column Data Type in Power BI
Power Query の「種類の変更」エラーを削除する
Power Query - Changing Data types | Power Query change data type all columns | Power Query tutorial