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To combine multiple retrievals, we write several SELECT statements and put the keyword between them. What is the keyword?

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To combine multiple retrievals, we write several SELECT statements and put the keyword between them. What is the keyword?

(a) COMBINE

(b) CONCAT

(c) JOIN

(d) UNION

I have been asked this question in an internship interview.

The origin of the question is Performing Multiple in division Using SQL to Manage Data of MySQL

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The correct answer is (d) UNION

The best explanation: The ‘UNION’ operator is used for combining the results of various ‘SELECT’ queries into one. For example, ‘SELECT a FROM table1 UNION SELECT a FROM table2;’ produces the results from tables table1 concatenated with that of table2.

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