Binary Relation (direct connection)

Meaning

The Binary Relation (direct connection) shows that two entity sets are connected to it take part in a relation.

This shape consists of the relation and two edges for simple use.

Note: A direct connection shall be avoided whenever possible. To maintain a comprehensive layout one should always prefer horizontal or vertical connections.

Utilization

Control Points

A ) moves the rectangular box along the axis
B1-B5 )
  • moves the position of the corresponding text box
  • appears only when text has been entered
  • to enter text, first click on the shape, then single-click on the text box and start typing or type F2 to edit an existing text

Context Menu

The context menu lets you set the type of the Binary Relation.

  n:m Relation - The relation box will become empty. You are encouraged to add the cardinalities in this case.
1:n Relation - This results in an arrow.
n:1 Relation - The same as 1:n Relation, just the arrow will point in the other direction.
1:1 Relation - This results in a double-headed arrow.

See also

Binary Relation (horizontal & vertical connection)
Curved Binary Relation (horizontal connection)
Curved Binary Relation (vertical connection)