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  1. For a table having 4 columns, the number of columns to which hash function is applied when using hash indexes is __________.
    1. 4
    2. 3
    3. 2
    4. 1
    5. None of these
Correct Option: D

In MySQL, for the hash indexes, a hash function is applied to each of the column values. The resulting hash values are stored in the index and used to perform lookups on it.


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