. What is union compatibility? Why do the UNION, INTERSECTION, and DIFFERENCE operations require that the relations on which they are applied be union compatible?

The discussion for the union compatibility can be defined as follows:

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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:

a few, because i should have plenty.

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