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Sagot :
Subtype discriminator is the attribute in the super type entity that determines to which entity subtype each super type occurrence is related. A super type entity's subtype discriminator is an attribute that establishes which subtype the super type occurrence belongs to separate subtypes: contain a special subset of the set of super type entities.
Only one of the subtypes may exist for each entity instance of the super type. In the aviation example, a worker could be a mechanic, a pilot, or an accountant. Attribute that one of the company regulations is that a worker is not permitted to be a member of more than one subtype at once, such as a mechanic and a pilot.
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