Data Models
A data model defines how data is structured, stored, and manipulated.
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Data Models
Learning Objectives
- •Understand different data models
- •Learn relational model basics
Lesson Outline
LearnStep 1/2
Data Models
Tree structure, one-to-many only. (IBM IMS)
2. Network Model
3. Relational Model
Data in tables (relations), most popular model.
4. Object-Oriented Model
Combines OOP concepts with database. Objects, inheritance, encapsulation.
5. Document Model (NoSQL)
json
Relational Model Terminology
| Term | Also Called |
|---|---|
| Relation | Table |
| Tuple | Row, Record |
| Attribute | Column, Field |
| Domain | Data type, Value set |
| Degree | Number of attributes |
| Cardinality | Number of tuples |