References : ERD Simple Model
Requirements :
...working...
Specialization:
Super-class : Stock (itemNo,price,Supplier); Subclass:Doors(numOfWindow),windows(typeOfGlass),accessories(Material,Usage).Nondisjoint constraint.
Super-class : Sale Agent ; Subclass : trainee,consultant. Disjoint constrainst
Super-class : Consultant ; Subclass : trainer,team leader. Nondisjoint constraint
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