Respuesta :
An attribute of the supertype that determines the target subtype(s) is called the subtype discriminator.
A subtype discriminator is a characteristic inside the supertype entity that determines to which subtype the supertype incidence is related. Discount and overlapping constraints. Disjoint subtypes: include a completely unique subset of the supertype entity set. each entity instance of the supertype may also simplest exist as one of the subtypes.
For example, in aviation instance, a worker can be a pilot or a mechanic, or an accountant. Assume that one of the business regulations dictates that a worker cannot belong to more than one subtype at a time; this is, an employee can not be a pilot and a mechanic at the same time.
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