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The two result sets bust each have the same number of columns and each pair of columns between the two must be of the same data type.

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Q: What are the requirements that two relations must satisfy in order to be considered union-compatible?
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What are the requirements that two relations must satisfy in order to be considered union compatible in a database?

When two or more rows share the same number of columns, and when their corresponding columns share the same (or compatible) domains, they are said to be union-compatible.


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