ER Diagram 관계 선 종류

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

Flowchart Maker & Online Diagram Software

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