Question

State main categories of data models.

Answer 1

Explanation:

data models are most important to us

they are taking important stage in society

Answer 2

The Hierarchical Model, Network Model, Entity-relationship Model, and Relational Model are the main categories of data models.

Explanation:

The following are the details of the categories of data models.

Hierarchical Model

• This model of the database organizes data into a tree-like structure, with a single root connected to all the other data.

Network Model

• This is a Hierarchical Model Extension. Data is arranged more like a graph in this model, and more than one parent node is required.

Entity-relationship Model

• Relationships are created in this model of a database by dividing an object of interest into an entity and its properties into attributes.

Relational Model

• In this model, data is arranged into two-dimensional tables, and a specific field is stored to maintain the relationship.