mirgro on 19 March 2010
| Rath said: I get that it's a disjoint specialization, my problem is with the participation and cardinality. I have a single relationship 'HAS_A' from 'B', however 'A1' and 'A2' both of which are related to B through 'HAS_A' have different cardinality and participation. Does this mean I have to create two 'HAS_A' relationships, one between B and A1 and one between B and A2 or is there some way to do it with a single relationship. |
From what I know you need 2. One for A1 one for A2, each with the specific cardinality. If the relationship was between B and A, not the A1 and A2, and had the same cardinality for all specs, then you would have been able to do one from B to A.
