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A hierarchical data model is a
data model which the data is organized into a tree like structure. The
structure allows repeating information using parent/child relationships: each
parent can have many children but each child only has one parent. All attributes
of a specific record are listed under an entity type.
Advantages:
1. The representation of records
is done using an ordered tree, which is natural method of implementation of one–to-many
relationships.
2. Proper ordering of the tree
results in easier and faster retrieval of records.
3. Allows the use of virtual
records. This result in a stable database especially when modification of the
data base is made.
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