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:
2. Click on the parent table symbol in the diagram canvas:
3. Hold the mouse click and drag the cursor to the child table:
This is how a simple relationship is displayed:
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:
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.
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”.
Available in: Free and Standard Editions