DATABASE FUNDAMENTALS
WHAT IS DATABASE MANAGEMENT
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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True
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False
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Either A or B
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None of the above
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Detailed explanation-1: -The hierarchical model represents data as a hierarchical tree structure. Each branch of the hierarchy represents a number of related records.
Detailed explanation-2: -Characteristics of hierarchical database models include their simplicity, but also their lack of flexibility. Hierarchical structures, unlike, relational databases, do not describe many-to-one relationships or many-to-many relationships due to the fact that child records can only have a single parent.
Detailed explanation-3: -A hierarchical database allows one to many relationships but not one to one relationships. In a relational database, relationships are specified by joining common data stored in records from different tables.
Detailed explanation-4: -The Hierarchical Model was the first database management system model. This concept uses a hierarchical tree structure to organise the data. The hierarchy begins at the root, which contains root data, and then grows into a tree as child nodes are added to the parent node.