Tutorial 2
How to Describe Data
The ER model describes data in terms of:
- Entities
- A thing which can be distinctly identified
- Attributes
- A property of an entity.
- Relationships
- An association among entities.
erDiagram
CUSTOMER ||--o{ ORDER : places
ORDER ||--|{ LINE-ITEM : contains
CUSTOMER }|..|{ DELIVERY-ADDRESS : uses
Attempt a data description of a system you know well:
- Scoping which part of the system do you want to represent
- Write three sentences that are relevant to the system and depict them graphically.
Use the system of YouTube
The group made the following:
