Data Modeler: How to create a self reference in ER?

Question

e.g. I create the entity EMP in a logical Subview. Two attributes are here essential for a self-reference: EMPNO and MGR. So each Employee has a reference to his boss. And this information is stored in MGR.
Now I create the entity EMP with the 8 columns from the SCOTT/TIGER schema. After that I define a 1:N-Relation between EMP and EMP. but it looks like I cannot define, which attributes are starting point of the relation and destination.
Who can help me here?
Gerd

Answer 1

Gerd,
you cannot select destination (as you said) attribute - they are automatically generated. However you can achieve what you want - it depends on your starting point:
1) start from logical model (analysis first)
- you create 1:n recursive relationship -
- change the name of created FK attribute to MGR or what ever you want - this is controlled by "FK Attribute name synchronization" setting at "General options>Model>Logical" page
2) start from relational model (reverse engineering of existing status)
- create self reference foreign key - select MGR as FK column;
- reverse engineer to logical model - you'll have FK attribute named MGR
Philip