For example if there is a person table, as superclass and different subclasses, and one general person sould be used in multiple subclasses. One person can be client and employee at the same time, and the data in the superclass should not be saved redundant.
For example if there is a person table, as superclass and different subclasses, and one general person sould be used in multiple subclasses. One person can be client and employee at the same time, and the data in the superclass should not be saved redundant.