A hierarchy is a natural hierarchy when each attribute included in the user-defined hierarchy has a one-to-many relationship with the attribute immediately below it.
Examples of Natural Hierarchies could be Year-Quarter-Month.
There are 4 Quarters in 1 Year – and there are 3 Months in one Quarter - one- to-many all the way.
Other Examples could be Itemgroup – Items or Countries – Regions - Cities.
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