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by WastingMyTime89 1267 days ago
Tell me in a comment you have never worked with business data in your life.

Business data is full of minor inconsistencies which are not obvious until you sit in front of it. Products are sold by different units. Reporting ranges and aggregates are slightly different. Subsidiaries use categories which are close but not exactly identical.

There is generally plenty of massaging to do before you can get the information you need.