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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.

题目
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.

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更多“In which scenario would index be most useful? () ”相关问题

  • 第1题：

    The research should prove invaluable in the study of linguistics.

    A:useless
    B:practical
    C:little
    D:useful

    答案：D
    解析：
    本句意思：该项研究对于语言学的研究应极有价值。invaluable意思是“非常宝贵的，极为贵重的”，与useful（有用的）意思相近。useless无用的，无价值的；practical实际的，实践的； little小的，少的。

  • 第2题：

    The chemical is deadly to rats but safe to cattle.

    A: fatal
    B: hateful
    C: good
    D: useful

    答案：A
    解析：
    句意为：这种化学药品对老鼠是致命的但对牛是安全的。画线单词deadly意为“致命的”。fatal意为“致命的”;hateful意为“可恨的”;good意为“好的”;useful意为“有用的”。根据画线单词意思，只有fatal与其同义，可进行替换。因此A项正确。

  • 第3题：

    MOST总线有哪些优点？


    C

  • 第4题：

    The research should prove invaluable the study of linguistics.

    A:useless
    B:practical
    C:little
    D:useful

    答案：D
    解析：
    本句意思：该研究应证明其在语言学方面很有价值。useless的意思为“无用的，无价值 的”;practical的意思为“实际的，可行的”;little的意思为“小的，少的”;useful的意思为“有用 的”。invaluable的意思为“非常宝贵的，极为贵重的”，它不是valuable的反义词，而是和valua- ble的意思相近。这里invaluable的意思和useful的意思接近。

  • 第5题：


    What is the author’s attitude towards“seeing is believing”？( )

    A.Positive
    B.Dangerous
    C.Negative
    D.Useful

    答案：C
    解析：

  • 第6题：

    在MOST数据总线系统中， 把光信号变成电压，然后该电压被发送到MOST收发器。


    错误

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