Question: [ Python / Data Analysis ] Why these four rows are considered as duplicated after I drop the ORDER _ ID column? If I included

[Python / Data Analysis] Why these four rows are considered as duplicated after I drop the ORDER_ID column? If I included the ORDER_ID, there are no duplicates. Since I am caculating the total sales for each product, I prefer not to drop the duplicates.
[ Python / Data Analysis ] Why these four rows

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