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DAX（Data Analysis Expressions）関数とは、ExcelのパワーピボットやPower BIで使用される数式言語です。 データモデル内の列やテーブルを計算・処理でき、DAX関数を使えるようになると、パワーピボットやPower BIで大量のデータを効率よく処理・計算できます。