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MySQL UNION

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  1. SELECT on a MERGE table is like _____________.
    1. UNION
    2. JOIN
    3. UNION ALL
    4. UNION DISTINCT
    5. None of these
Correct Option: C

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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