Data Modeling
Data Modeling Skill
Purpose
Create clear data models that document data structures, relationships, and business rules for system design and development.
When to Use
- Designing new database structures
- Documenting existing data for analysis
- Defining data requirements in FRS
- Integration design between systems
- Data migration planning
Data Modeling Concepts
Entity Relationship Diagram (ERD)
Entities: Objects/things we store data about (e.g., Customer, Order, Product) Attributes: Properties of entities (e.g., customer_name, order_date) Relationships: How entities relate to each other
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