Question

answer please for this.
question) for a table T , the characteristic of three of its columns are given below.
1) column A has unique values
2) column B has wide range of values
3)column C has many nulls and non null values are not searched much.
which of these columns /s is/are good for indexing?

a) A b) C c)None d) B

Answer 1

A) is good for indexing as indexing values must be unique .
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