Which two statements about views are true? ()A. A view can be created as read only.B. A view can be created as a join on two or more tables.C. A view cannot have an ORDER BY clause in the SELECT statement.D. A view cannot be created with a GROUP BY clause

题目
Which two statements about views are true? ()

A. A view can be created as read only.

B. A view can be created as a join on two or more tables.

C. A view cannot have an ORDER BY clause in the SELECT statement.

D. A view cannot be created with a GROUP BY clause in the SELECT statement.

E. A view must have aliases defined for the column names in the SELECT statement.

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更多“Which two statements about views are true? () ”相关问题

  • 第1题：

    Whichdependentobjectwillgetinvalidatedevenifitisnotaffectedbythetableedefinition?()

    A.packages

    B.triggers

    C.synonyms

    D.views


    参考答案：B

  • 第2题：

    下列复选框构造方法，错误的是()。

    A．setLayout(newGridLayout(3,1));

    B．add(newCheckbox("one",null,true));

    C．add(newCheckbox("tWO");

    D．add(newCheckbox("one",true);


    正确答案：D

  • 第3题：

    12． About_______ of the workers in the factory were born in the __________．

    A． two- thirds;1970

    B． two- thirds ; 1970s

    C． two-third ; 1970

    D． two-third ; 1970s


    正确答案：B
    12．B【解析】句意：工厂里大约2/3的工人出生在20世纪70年代。分数的表达为分子用基数词，分母用序数词，如果分子大于1，则分母要用复数，排除C、D，年代的表达要在年份后加s．故选B。

  • 第4题：

    下列复选框构造方法，错误的是 ( )

    A．setLayout(new GridLayout(3，1))；

    B．add(new Checkbox("one"，null，true))；

    C．add(new Checkbox("two"))；

    D．add(new Checkbox("one"，true))；


    正确答案：D
    解析：该题考查复选框的构造方法。构造方法的一般格式为：public Checkbox (String label，CheckboxGrou Pgroup，boolean state)。选项A、B、C都是正确的，而选项D是错误的，它的第二个参数应该是CheckboxGrou Pgroup，所以选项D是错误的。

  • 第5题：

    About ________ of the workers in the factory were born in the ________.

    A.two-thirds, 1970 B.two-thirds, 1970s C.two-third,1970 D.two-third, 1970s


    正确答案：B

  • 第6题：

    Norman Blarney is an artist of deep convictions.

    A: claims
    B:suggestions
    C: beliefs
    D:statements

    答案：C
    解析：
    句意：诺曼.布莱梅是一个有坚定信念的艺术家，句中画线部分conviction意为 “信念”。claim意为“要求，声称”。suggestion意为“建议”。belief意为“相信，信赖”。 statement意为“声明，陈述”。画线部分和C项意义接近。故选C项。

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