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chore: update ER diagram docs

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on-behalf-of: @Mermaid-Chart <hello@mermaidchart.com>
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darshanr0107
2025-09-03 13:10:50 +05:30
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38
docs/syntax/entityRelationshipDiagram.md
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@@ -135,6 +135,44 @@ erDiagram
"This **is** _Markdown_" "This **is** _Markdown_"
``` ```
#### Optional Relationship Labels
Starting from Mermaid version 11.11.0, the relationship label in ER diagrams is optional. You can define relationships without specifying a label, and the diagram will render correctly.
For example, the following is valid:
```mermaid-example
erDiagram
BOOK }|..|{ AUTHOR
BOOK }|..|{ GENRE
AUTHOR }|..|{ GENRE
```
```mermaid
erDiagram
BOOK }|..|{ AUTHOR
BOOK }|..|{ GENRE
AUTHOR }|..|{ GENRE
```
This will show the relationships between the entities without any labels on the connecting lines.
You can still add a label if you want to describe the relationship:
```mermaid-example
erDiagram
BOOK }|..|{ AUTHOR : written_by
BOOK }|..|{ GENRE : categorized_as
AUTHOR }|..|{ GENRE : specializes_in
```
```mermaid
erDiagram
BOOK }|..|{ AUTHOR : written_by
BOOK }|..|{ GENRE : categorized_as
AUTHOR }|..|{ GENRE : specializes_in
```
### Relationship Syntax ### Relationship Syntax
The `relationship` part of each statement can be broken down into three sub-components: The `relationship` part of each statement can be broken down into three sub-components:

24
packages/mermaid/src/docs/syntax/entityRelationshipDiagram.md
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@@ -89,6 +89,30 @@ erDiagram
"This **is** _Markdown_" "This **is** _Markdown_"
``` ```
#### Optional Relationship Labels
Starting from Mermaid version 11.11.0, the relationship label in ER diagrams is optional. You can define relationships without specifying a label, and the diagram will render correctly.
For example, the following is valid:
```mermaid-example
erDiagram
BOOK }|..|{ AUTHOR
BOOK }|..|{ GENRE
AUTHOR }|..|{ GENRE
```
This will show the relationships between the entities without any labels on the connecting lines.
You can still add a label if you want to describe the relationship:
```mermaid-example
erDiagram
BOOK }|..|{ AUTHOR : written_by
BOOK }|..|{ GENRE : categorized_as
AUTHOR }|..|{ GENRE : specializes_in
```
### Relationship Syntax ### Relationship Syntax
The `relationship` part of each statement can be broken down into three sub-components: The `relationship` part of each statement can be broken down into three sub-components: