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A UNION query is which of the following?

Combines the output from multiple queries and does not include the same number of columns.
Combines the output from multiple queries and must include the same number of columns.
Combines the output from no more than two queries and does not include the same number of columns.
Combines the output from no more than two queries and must include the same number of columns.

Correct Answer: Combines the output from multiple queries and must include the same number of columns.

Explanation:

A UNION query combines the output from multiple queries and must include the same number of columns.

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