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

In which scenario would 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.

出自：Oracle认证

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