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Initial documentation for ER diagrams

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Adrian Hall 2020-03-18 09:31:10 +00:00
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# Entity Relationship Diagrams
> An entity–relationship model (or ER model) describes interrelated things of interest in a specific domain of knowledge. A basic ER model is composed of entity types (which classify the things of interest) and specifies relationships that can exist between entities (instances of those entity types). Wikipedia.
Mermaid can render ER diagrams
```
erDiagram
CUSTOMER !-?< ORDER : places
ORDER !-!< LINE-ITEM : contains
```
```mermaid
erDiagram
CUSTOMER !-?< ORDER : places
ORDER !-!< LINE-ITEM : contains
```
## Syntax
### Entities and Relationships
To be completed