Creating a new relationship

ERBuilder Data Modeler always creates relationships by linking the parent table to the child table. To create a new relationship:

1.    Select one of the two available relationship icons:

RELATION ISON

2.    Click on the parent table symbol in the diagram canvas:

parent table

3.    Hold the mouse click and drag the cursor to the child table:

image

This is how a simple relationship is displayed:

image

The result is the added arrow captioned “Reference_1” and the inclusion of the “Parent_ID” attribute in the “Child Table”.

By contrast, a many-to-many relationship is displayed as follows:

image

The result is the creation of “Reference_1” and “Reference_2” arrows and the inclusion of “Parent_ID” and “Child_ID” attributes in the new “Relation Table (Table2)”.

As for reflexive relationships, you can create these types of relationships by right-clicking on the table and selecting “Reflexive Relationship” from the menu.

reflexive relation

The result is the appearance of a “Reference_1” reflexive arrow in the diagram and the “Parent_ID_1” attribute creation in the table “Parent Table”.

reflexive relation ex

 

Available in: Free and Standard Editions