Answer / 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.

Answer / taeaone

The original meaning of hierarchy was rule by priests, which usually involved a rigid ordered structure - such as priests, bishops, archbishops. Now it is normally used for anything with an ordered structure.
A system or organization in which people or groups are ranked one above the other according to status or authority.
A hierarchy is an arrangement of items (objects, names, values, categories, etc.) The
word can also refer to a series of such items so arranged. Items in a hierarchy are
thought of typically as including or being "above," included by or being "below," or
independent of (being "at the same level as") one another.

A hierarchy can link entities either directly or indirectly, and either vertically or
horizontally. The only direct links in a hierarchy, insofar as they are hierarchical, are to
one's immediate superior or to one of one's subordinates, although a system that is
largely hierarchical can also incorporate other organizational patterns. Indirect
hierarchical links can extend "vertically" upwards or downwards via multiple links in the
same direction. All parts of the hierarchy which are not linked vertically to one another
nevertheless can be "horizontally" linked by traveling up the hierarchy to find a
common direct or indirect superior, and then down again. This is akin to two co-
workers, neither of whom is the other's boss, but both of whose chains of command
will eventually meet.

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