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SELECT on a MERGE table is like _____________

SELECT on a MERGE table is like _____________

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asked Jul 21, 2021 in MySQL by Genesis (122k points)

SELECT on a MERGE table is like _____________

(a) UNION ALL

(b) UNION

(c) UNION DISTINCT

(d) JOIN

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I need to ask this question from Performing Multiple in chapter Using SQL to Manage Data of MySQL

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1 Answer

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answered Jul 23, 2021 by Grace (692k points)
selected Jul 24, 2021 by Genesis

Best answer

The correct answer is (a) UNION ALL

Easiest explanation: Performing a ‘SELECT’ operation on a ‘MERGE’ table is like performing ‘UNION ALL’. This means that duplicate row results are not removed. ‘SELECT DISTINCT’ is like ‘UNION’ or ‘UNION DISTINCT’.

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