all image captured from: https://www.draw.io 

 

Flowchart Maker & Online Diagram Software

Flowchart Maker and Online Diagram Software draw.io is free online diagram software. You can use it as a flowchart maker, network diagram software, to create UML online, as an ER diagram tool, to design database schema, to build BPMN online, as a circuit d

app.diagrams.net

Untitled Relation
Mandatory Participation (0:1)
Mandatory Participation (0:N)
Mandatory Participation (M:N)
Optional Participation (0:1)
Optional Participation (0:N)
Optional Participation (M:N)
Recursive Relationship (0:1)
Recursive Relationship (0:N)
Recursive Relationship (M:N)
0 to Many Optional
1 to Many
1 to 1
1
0 to 1
Many
Many to Many
1 Optional to Many Optional
1 Mandatory to Many Optional
1 Mandatory to 1 Optional
1 Mandatory to Many Mandatory
1 Optional to Many Mandatory
Many Mandatory to Many Mandatory
Many Optional to Many Mandatory
Many Optional to Many Optional

 

example: https://app.diagrams.net/#G1X_L7ekPnlbn-eyTuAA86J2DoSuhPz1Aj

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