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Oracle认证考试

睦霖题库>其他计算机考试>Oracle认证考试

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.
正确答案:D
答案解析:
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