Respuesta :
Answer:
Union compatibility is the two relations are said to be union compatible if both the relations have the same number of attributes and the domain of the similar attributes is same. (It's to have the same attributes and domain)
If we do a Union, Intersection or a Difference operation on two different relations, it is necessary for them to be union compatible because all these operations are set operations which are binary. And, for the result to be a relation, it is bound to have the tuples of the same no of attributes and the domain should be same too.
Explanation:
The discussion for the union compatibility can be defined as follows:
- The number of properties matched by relationships is one, and the domains are shared by corresponding qualities.
- When two relations have the same number of attributes and the same domain of related attributes, they are said to be union compatible.
- Since these are binary sets operations, all UNION, INTERSECTION, and DIFFERENCE operations all require that relations that applied to the union are compatible.
- Under these actions, the tuples of relations are compared directly, and the tuples must have the same number of features.
- And the domains of the comparable attributes would be the same.
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