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Issuing ‘SELECT’ on a MERGE table is like _____________

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Issuing ‘SELECT’ on a MERGE table is like _____________

(a) UNION

(b) UNION ALL

(c) UNION DISTINCT

(d) JOIN

This question was posed to me in an online quiz.

My question is taken from Perl Script Characteristics topic in section MySQL Programs Using Perl DBI and PHP of MySQL

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The correct answer is (b) 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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