What is a hierarchical database model?
Q: What is a hierarchical database model?
A: It is a data model where the data is organized like a tree.
Q: How is repeating information allowed in a hierarchical database model?
A: Repeating information is allowed using parent/child relationships where each parent can have many children but each child only has one parent.
Q: What is an entity type in a database?
A: An entity type is the equivalent of a table where all attributes of a specific record are listed.
Q: How is each individual record represented in a database?
A: Each individual record is represented as a row and an attribute as a column.
Q: How are entity types related to each other in a database?
A: Entity types are related to each other using 1:N mapping, also known as one-to-many relationships.
Q: What are the most recognized and used hierarchical databases?
A: The most recognized and used hierarchical databases are IMS developed by IBM and Windows Registry by Microsoft.
Q: What is the difference between a parent and a child in a hierarchical database model?
A: A parent can have many children, but each child only has one parent.
