Research:Mermaid style ER diagram explained

Diagram symbols (legend)

The small symbols at the ends of lines indicate whether there is one or many items.

<mermaid> erDiagram

   ONE ||--|| ONE : "one-to-one"

   ONE ||--o{ MANY : "one-to-many"

   MANY }o--|| ONE : "many-to-one"

   MANY }o--o{ MANY : "many-to-many"

</mermaid>

Meaning in simple words:

• || = exactly one
• o{ or }o = many
• Lines show how things are connected