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database advanced sql
1. A UNION query is which of the following?
(A): Combines the output from multiple queries and does not include the same number of columns.
(B): Combines the output from multiple queries and must include the same number of columns.
(C): Combines the output from no more than two queries and does not include the same number of columns.
(D): Combines the output from no more than two queries and must include the same number of columns.
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