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A UNION query is which of the following?

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in SQL Server by (80.5k points)
A UNION query is which of the following?

(a) Combines the output from no more than two queries and must include the same number of columns

(b) Combines the output from no more than two queries and does not include the same number of columns

(c) Combines the output from multiple queries and must include the same number of columns

(d) Combines the output from multiple queries and does not include the same number of columns

The question was posed to me in semester exam.

This interesting question is from Joins topic in division Laying the Foundation of SQL Server

1 Answer

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Best answer
Correct choice is (c) Combines the output from multiple queries and must include the same number of columns

Easiest explanation: A single UNION can combine only 2 sql query at a time.

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