Hello, 

You may be the person who can help me on the example below:

Class: Post_Stratum

        Attributes:

        Industry (key field)
        PostStrata (key field)

        
Class: Collected_Stratum

        Attributes:

        Industry (key field)
        CollectedStrata (key field)


Class: Collapse_Plan  /* has relationship with Post_Stratum and
Collected_Stratum */

        Expected columns (after transformed to data model):

        Industry
        Strata 
        CollapseStrata

- Collapse_Plan.Strata will be PostStrata (if exist in POST_STRATUM for an
Industry). 
 If there is no PostStrata for the Industry, then Collapse_Plan.Strata will
be CollectedStrata in Collected_Stratum.

How to show the relationships of these 3 classes in object model?  Also,
what attributes to specify in Collapse_Plan class?

Thanks.

Yue-Hwa



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