Which of the following is true of an index used to support a UNIQUE constraint?（）A、It must have the UNIQUE attribute.B、It cannot be created explicitly by the user.C、It must have the UNIQUE and CLUSTER attributes.D、It must have the UNIQUE WHERE NOT NULL at

题目

Which of the following is true of an index used to support a UNIQUE constraint?（）

  • A、It must have the UNIQUE attribute.
  • B、It cannot be created explicitly by the user.
  • C、It must have the UNIQUE and CLUSTER attributes.
  • D、It must have the UNIQUE WHERE NOT NULL attribute.
相似考题

1.Which of the following is TRUE about the family Katy is living with?A. They are friendly. B. There are three people in their house.C. They are strange. D. They have never taken Katy to the parties.

2.Which of the following is NOT true?A. Colour probably has an effect on us which we are not conscious of.B. Our feelings about certain colours are purely psychology.C. Food should never be packaged in brown.D. Sugar sells badly in green wrappings.

3.Which one in the following expressions in Not True?A、As wise as a fox.B、As strong as a horse.C、As happy as a lark.D、As stupid as a goose.

4.Which of the following statements about Leopold and Rudolph Blaschka is TRUE?A. They were brothers.B. They were artists.C. They were florists.D. They were farmers.

更多“Which of the following is true o”相关问题

  • 第1题：

    Which of the following is NOT true about the centrifugal separator?

    A.It can be applied to separate two liquids

    B.It cannot separate solids which contaminated in the oil.

    C.It consists of purifier and clarifier

    D.The centrifuge arranged to separate two liquids is known as purifier


    答案：B

  • 第2题：

    Is the following statement true or false?

    A significant change in the ownership of an existing audit client is a factor which makes it appropriate for the auditor to review the terms of engagement.

    A.True

    B.False


    正确答案：A

    Where there is a significant change in ownership of the company, ISA 210 Agreeing the Terms of Audit Engagements recommends that a new audit engagement letter is sent to avoid misunderstandings.

  • 第3题：

    Which of the following is Not True?

    A. Advertisement makes contribution to our pockets and we may know everything
    B. We can buy what we want
    C. Products of good quality don't need to be advertised
    D. Advertisement makes our life colorful
    19. Which of the following is Not True?

    答案：C
    解析：
    A、B、D项均可在文中找到依据；C项说法错误，优质产品也可能需要广告的宣传。

  • 第4题：

    Which of the following is not true of Ireland.s climate?（）

    • A、It is dry.
    • B、It is moist.
    • C、It is mild.
    • D、It is changeable

    正确答案:A

  • 第5题：

    Which of the following is TRUE about a caching name server？（）

    • A、They must have a trusted SSL certificate
    • B、They can be authoritative
    • C、They cannot be load-balanced
    • D、They can be recursive
    • E、They require DHCP

    正确答案:B,D

  • 第6题：

    Which of the following metrics provided by the iostat report is used to initially determine if a system is I/O bound？（）

    • A、 % idle
    • B、 % sys
    • C、 % user
    • D、 % iowait

    正确答案:D

  • 第7题：

    Which of the following commands should be used to determine which disk of a system is experiencing a disk I/O performance problem？（）

    • A、 filemon
    • B、 istat
    • C、 vmstat
    • D、 iostat

    正确答案:D

  • 第8题：

    Which of the following statements are true？（） 

    • A、 The equals（） method determines if reference values refer to the same object.
    • B、 The == operator determines if the contents and type of two separate objects match.
    • C、 The equals（） method returns true only when the contents of two objects match.
    • D、 The class File overrides equals（） to return true if the contents and type of two separate objects        match.

    正确答案:A,D

  • 第9题：

    单选题
    Which of the following commands should be used to determine which disk of a system is experiencing a disk I/O performance problem？（）
    A

     filemon

    B

     istat

    C

     vmstat

    D

     iostat


    正确答案： A
    解析： 暂无解析

  • 第10题：

    单选题
    Which of the following is true about the fuel injection with an ordinary diesel engine?（）
    A

    The process begins after TDC

    B

    The process ends before TDC

    C

    When the piston is near to the TDC the fuel injection ends

    D

    None of the above is true


    正确答案： D
    解析： 暂无解析

  • 第11题：

    单选题
    public class Test{  public static void main（ String[] argv ）{  // insert statement here  }  }   Which statement， inserted at line 3， produces the following output？（）  Exception in thread “main” java.lang.AssertionError： true at Test.main（Test.java：3）
    A

     assert true；

    B

     assert false；

    C

     assert false ： true；

    D

     assert false == true；

    E

     assert false： false；


    正确答案： C
    解析： 暂无解析

  • 第12题：

    多选题
    Which expressions will evaluate to true if preceded by the following code？（）   String a = "hello"；   String b = new String（a）；   String c = a；   char[] d = { ’h’， ’e’， ’l’， ’l’， ’o’ }；
    A

    （a == Hello）

    B

    （a == b）

    C

    （a == c）

    D

    a.equals（b）

    E

    a.equals（d）


    正确答案： D,C
    解析： 暂无解析

  • 第13题：

    According to Paragraph 2, which of the following is true of colours?

    A Colors are encoded in girls' DNA

    B Blue used to be regarded as the color for girls

    C Pink used to be a neutral color in symbolizing genders

    D White is preferred by babies


    正确答案：B

  • 第14题：

    Which of the following statements is true regarding simple sort techniques?

    A．exchange sort if frequently referred to as a bubble sort.

    B．exchange sort is the least expensive.

    C．if random data are in an array that is to be sorted ,an insertion sort will give then best performance for large elements with small sort items.

    D．both insertion sort an selection sort require O(n) moves.


    正确答案：A

  • 第15题：

    Which of the following is not true of Ireland.s climate?（）

    AIt is dry.

    BIt is moist.

    CIt is mild.

    DIt is changeable


    A
    略

  • 第16题：

    Which of the following is true regarding Label Distribution Protocol （LDP）？（）

    • A、It is a label distribution protocol for MPLS
    • B、It is a set of procedures and messages by which LSRs establish Label Switch Paths （LSPs） through a network
    • C、Tag distribution Protocol （TDP） was the basis for LDP
    • D、All of the above are true

    正确答案:D

  • 第17题：

    Which expressions will evaluate to true if preceded by the following code？（）   String a = "hello"；   String b = new String（a）；   String c = a；   char[] d = { ’h’， ’e’， ’l’， ’l’， ’o’ }；  

    • A、（a == "Hello"）
    • B、（a == b）
    • C、（a == c）
    • D、a.equals（b）
    • E、a.equals（d）

    正确答案:C,D

  • 第18题：

    Which of the following phrases is TRUE regarding monitoring disk I/O with iostat？（）

    • A、 The iostat can only be run as the root user
    • B、 There could be zero percent I/O wait and still be an I/O bottleneck
    • C、 Any I/O wait time displayed in output of "iostat" is an indication of severe I/O bottlenecks 
    • D、 Running "iostat" without any arguments/parameters is sufficient for resolving I/O bottlenecks

    正确答案:B

  • 第19题：

    public class Test{  public static void main（ String[] argv ）{  // insert statement here  }  }   Which statement， inserted at line 3， produces the following output？（）  Exception in thread “main” java.lang.AssertionError： true at Test.main（Test.java：3）  

    • A、 assert true；
    • B、 assert false；
    • C、 assert false ： true；
    • D、 assert false == true；
    • E、 assert false： false；

    正确答案:C

  • 第20题：

    单选题
    Captain Ahab is a character in which of the following works?
    A

    Moby Dick

    B

    “O Captain, My Captain”

    C

    The Gilded Age

    D

    Walden


    正确答案： C
    解析：
    亚哈船长是赫尔曼·梅尔维尔的《白鲸》中的一个主要主人公。故选A。

  • 第21题：

    单选题
    Which of the following phrases is TRUE regarding monitoring disk I/O with iostat？（）
    A

     The iostat can only be run as the root user

    B

     There could be zero percent I/O wait and still be an I/O bottleneck

    C

     Any I/O wait time displayed in output of iostat is an indication of severe I/O bottlenecks 

    D

     Running iostat without any arguments/parameters is sufficient for resolving I/O bottlenecks


    正确答案： D
    解析： 暂无解析

  • 第22题：

    单选题
    Which of the following is NOT TRUE?
    A

    Maggie had two children.

    B

    Maggie was once a slave.

    C

    Maggie was good at math.

    D

    Maggie taught for a while.


    正确答案： B
    解析：
    根据文章第一段“Her mother was once a slave in a rich woman’s house”可以知道，她的母亲曾经是一个富太太家的奴隶，并不是说Maggie曾经是奴隶，所以B项说法错误。根据第二段第三句“They had two sons”可知，Maggie有两个孩子，这与A项相符。第一段提到“She was a very good student, especially in math”，Maggie数学很好，这与C项相符。根据第二段第一句“she got a job as a teacher”可以知道，Maggie当过一段时间的老师，这与D项相符。

  • 第23题：

    单选题
    Which of the following is true regarding Label Distribution Protocol （LDP）？（）
    A

    It is a label distribution protocol for MPLS

    B

    It is a set of procedures and messages by which LSRs establish Label Switch Paths （LSPs） through a network

    C

    Tag distribution Protocol （TDP） was the basis for LDP

    D

    All of the above are true


    正确答案： B
    解析： 暂无解析

  • 第24题：

    多选题
    Which of the following is TRUE about a caching name server？（）
    A

    They must have a trusted SSL certificate

    B

    They can be authoritative

    C

    They cannot be load-balanced

    D

    They can be recursive

    E

    They require DHCP


    正确答案： E,C
    解析： 暂无解析

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