What is hierarchy?

Answer Posted / ravikumar

A hierarchy is a method of displaying a characteristic
structured and grouped according to individual evaluation
criteria.

A hierarchy is created from nodes. The relationships
between the nodes are defined as follows:

* The uppermost node is the root. There can be more than
one root. They do not have a superior node.
* Exactly one other node is directly superior to each
node (except for the uppermost node).

Hierarchy Levels

All nodes on the same level of the hierarchy (nodes that
are the same distance away from the root) form a hierarchy
level. The roots of a hierarchy form level 1. The level of
a node denotes the distance from the node to the root.

Leaves

The leaves of a hierarchy consist of characteristic values
for the basic characteristic and therefore can also have
entries in the fact table. In contrast to nodes that can be
posted, a leaf cannot have any subnodes.

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