For a table having 4 columns, the number of columns to which hash function is applied when using hash indexes is __________(a) 1(b) 2(c) 3(d) 4The question was asked in homework.I want to ask this question from Using Indexing in chapter Query Optimization of MySQL

For a table having 4 columns, the number of columns to which hash func

1.	For a table having 4 columns, the number of columns to which hash function is applied when using hash indexes is __________(a) 1(b) 2(c) 3(d) 4The question was asked in homework.I want to ask this question from Using Indexing in chapter Query Optimization of MySQL
Answer» Right answer is (d) 4 To elaborate: 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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For a table having 4 columns, the number of columns to which hash function is applied when using hash indexes is __________(a) 1(b) 2(c) 3(d) 4The question was asked in homework.I want to ask this question from Using Indexing in chapter Query Optimization of MySQL

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