单选题In which scenario would an index be most useful?（）AThe indexed column is declared as NOT NULL.BThe indexed columns are used in the FROM clause.CThe indexed columns are part of an expression.DThe indexed column contains a wide range of values.
单选题
In which scenario would an index be most useful?（）
A
The indexed column is declared as NOT NULL.
B
The indexed columns are used in the FROM clause.
C
The indexed columns are part of an expression.
D
The indexed column contains a wide range of values.
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