DATEDIFF('day', LOOKUP(MIN([Order Date]),-1), MIN([Order Date]))
DATEDIFF() 関数は、2 つの日付間の指定された日付要素 (この場合は日) の数を検索します。開始日は LOOKUP(MIN([Order Date]),-1) で、1 行前の日付が返されます。
表関数では、計算をさらにカスタマイズできるように、異なる方法で計算することができます。ステップ 8 の例では、すべての顧客に対してカウントを再開します。変更できる表関数の詳細については、「表計算での値の変換」を参照してください。
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