Introduction to Data Models
Last updated
Last updated
A data model is a collection of tools for describing data and the associated relationships, semantics and constraints.
There are several kinds of data models:
Relational Model
ER (Entity-Relationship) Model
Object-Based Data Models (Object-Oriented and Object-Relational)
Semi-Structured Data Models
Other Models (Network Model, Hierarchical Model etc.)
This model assumes each table to be a relation.
The attributes/relation names are represented as columns of the table and the values for the relations are represented in the rows of the table.
The Relational Model is discussed in detail in later chapters.
This model describes a set of entities and the relationships between them. It is mainly used for database design.
It is an extension of the relational data model. It includes object orientation and constructs to support additional data types.
It was created to represent data where data items of the same type may have different attributes. It can represent the information of some data sources that cannot be constrained by schema.
Semi-structured data model uses XML (Extensible Markup Language).
