Every value in arelation must be().A.composite(复合的)and single-valuedB.single-valuedC.notnull and single-valuedD.simple and single-valued

题目
Every value in arelation must be().

A.composite(复合的)and single-valued

B.single-valued

C.notnull and single-valued

D.simple and single-valued

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更多“Every value in arelation must be(). ”相关问题

  • 第1题：

    Arelation(from the relational database model)consistsof(由⋯⋯组成)a set of tuples(元组),whichimplies(意味着)that().

    A.all tuples in a relation must be distinct(独一无二的)

    B.every relation has a key(键)

    C.all of the above

    D.for any two tuples,the values associated with one or more of thei rattributes(属性)must differ


    答案C

  • 第2题：

    If your passenger vessel is fitted with a loudspeaker system，it must be tested at least once ______.

    A.every week

    B.a day

    C.every trip

    D.a watch or once a trip，whichever is shorter


    正确答案：A

  • 第3题：

    Every oil tanker of 150 GT and above and every other ship of 400 GT and above must now carry on board a ______．

    A.MCA

    B.MRCC

    C.SOSREP

    D.MCA


    正确答案：C

  • 第4题：

    每天早上值班水手必须在驾驶台做清洁工作。（）

    • A、Every morning the duty sailor must do the cleaning work on the bridge.
    • B、Every evening the duty sailor must do the cleaning work on the bridge.
    • C、Every morning the duty sailor must do the painting work on the bridge.

    正确答案:A

  • 第5题：

    What is true regarding subqueries?（）

    • A、The inner query always sorts the results of the outer query
    • B、The outer query always sorts the results of the inner query
    • C、The outer query must return a value to the outer query
    • D、The inner query returns a value to the outer query
    • E、The inner query must always return a value or the outer query will give an error

    正确答案:D

  • 第6题：

    Which statement is true regarding the COALESCE function?（）

    • A、It can have a maximum of five expressions in a list 
    • B、It returns the highest NOT NULL value in the list for all rows 
    • C、It requires that all expressions in the list must be of the same data type 
    • D、It requires that at least one of the expressions in the list must have a NOT NULL value

    正确答案:C

  • 第7题：

    What is true regarding subqueries?（）

    • A、The inner query always sorts the results of the outer query.
    • B、The outer query always sorts the results of the inner query.
    • C、The outer query must return a value to the inner query.
    • D、The inner query returns a value to the outer query.
    • E、The inner query must always return a value or the outer query will give an error.

    正确答案:D

  • 第8题：

    单选题
    The discharge side of every fire pump must be equipped with a（）.
    A

    gate valve

    B

    pressure gauge

    C

    check valve

    D

    strainer


    正确答案： B
    解析： 暂无解析

  • 第9题：

    多选题
    A custom JSP tag must be able to support an arbitrary number of attributes whose names are unknown when the tag class is designed.  Which two are true？ （）
    A

    A  element in the echo tag LTD must have the value JSP

    B

    The echo tag handler must define the setAttribute （String key， String value） method

    C

    The true element must appear in the echo tag TLD

    D

    The class implementing the echo tag handler must implement the javax.sevlet.jsp.tagext.IterationTag interface

    E

    The class implementing the echo tag handler must implement the javax.sevlet.jsp.tagext.DynamicAttributes interface


    正确答案： E,B
    解析： 暂无解析

  • 第10题：

    单选题
    Given a method that must ensure that its parameter is not null： 11. public void someMethod（Object value） { 12. // check for null value ... 20. System.out.println（value.getClass（））； 21. } What inserted at line 12， is the appropriate way to handle a null value？（）
    A

    assert value == null；

    B

    assert value != null， value is null；

    C

    if （value == null） { throw new AssertionException（value is null）； }

    D

    if （value == null） { throw new IllegalArgumentException（value is null）； }


    正确答案： A
    解析： 暂无解析

  • 第11题：

    单选题
    What is true regarding subqueries?（）
    A

    The inner query always sorts the results of the outer query.

    B

    The outer query always sorts the results of the inner query.

    C

    The outer query must return a value to the inner query.

    D

    The inner query returns a value to the outer query.

    E

    The inner query must always return a value or the outer query will give an error.


    正确答案： C
    解析： 暂无解析

  • 第12题：

    单选题
    Light Lists for coastal waters are（）.
    A

    published every year and require no corrections

    B

    published every second year and must be corrected

    C

    published every five years and require no correction

    D

    accurate thru NM number on title page and must be corrected


    正确答案： B
    解析： 暂无解析

  • 第13题：

    A jack-up drilling unit elevated on the Outer Continental Shelf must have a fog horn that will sound ______.

    A.a 2-second blast every 20 seconds

    B.a 4-second blast every 20 seconds

    C.an 8-second blast every 30 seconds

    D.a 10-second blast every 30 seconds


    正确答案：A

  • 第14题：

    Each life jacket light that has a non-replaceable power source must be replaced ______．

    A.every 6 months after initial installation

    B.every 12 months after initial installation

    C.every 24 months after initial installation

    D.on or before the expiration date of the power source


    正确答案：D

  • 第15题：

    Every officer and every soldier_______obey the rules.

    A.had to
    B.have to
    C.has to
    D.must have to

    答案：C
    解析：

  • 第16题：

    A custom JSP tag must be able to support an arbitrary number of attributes whose names are unknown when the tag class is designed.  Which two are true？ （）

    • A、 A  element in the echo tag LTD must have the value JSP
    • B、 The echo tag handler must define the setAttribute （String key， String value） method
    • C、 The true element must appear in the echo tag TLD
    • D、 The class implementing the echo tag handler must implement the javax.sevlet.jsp.tagext.IterationTag interface
    • E、 The class implementing the echo tag handler must implement the javax.sevlet.jsp.tagext.DynamicAttributes interface

    正确答案:C,E

  • 第17题：

    What must be included in a SOAP fault message when an error occurs due to a value in the message Body element？（）

    • A、 A detail element
    • B、 A Body fault code
    • C、 An application-specific fault code
    • D、 A fault string element with a value of "Body"

    正确答案:A

  • 第18题：

    You executed the following code：   BEGIN   DBMS_SCHEDULER.SET_ATTRIBUTE  （  NAME => ’JOB_A’，   ATTRIBUTE => ’JOB_PRIORITY’，   VALUE => 7）；   END；  /   After analyzing the above code， what conclusion will you draw？（）  

    • A、 The code will be executed successfully.
    • B、 The code will not be executed successfully because the value of the VALUE parameter must be 1， 2， or 3.
    • C、 The code will not be executed successfully because the value of the VALUE parameter must range between 1 and 5.
    • D、 The code will not be executed successfully because no SET_ATTRIBUTE procedure exists in the DBMS_SCHDULER package.

    正确答案:C

  • 第19题：

    单选题
    The chairman proposed that every speaker must limit himself to fifteen minutes.
    A

    every speaker

    B

    must

    C

    himself

    D

    to


    正确答案： A
    解析：

  • 第20题：

    单选题
    What is true regarding subqueries?（）
    A

    The inner query always sorts the results of the outer query

    B

    The outer query always sorts the results of the inner query

    C

    The outer query must return a value to the outer query

    D

    The inner query returns a value to the outer query

    E

    The inner query must always return a value or the outer query will give an error


    正确答案： B
    解析： 暂无解析

  • 第21题：

    单选题
    You executed the following code：   BEGIN   DBMS_SCHEDULER.SET_ATTRIBUTE  （  NAME => ’JOB_A’，   ATTRIBUTE => ’JOB_PRIORITY’，   VALUE => 7）；   END；  /   After analyzing the above code， what conclusion will you draw？（）
    A

     The code will be executed successfully.

    B

     The code will not be executed successfully because the value of the VALUE parameter must be 1， 2， or 3.

    C

     The code will not be executed successfully because the value of the VALUE parameter must range between 1 and 5.

    D

     The code will not be executed successfully because no SET_ATTRIBUTE procedure exists in the DBMS_SCHDULER package.


    正确答案： D
    解析： 暂无解析

  • 第22题：

    单选题
    You are an administrator of a large campus network. Every switch on a floor within each building of your campus has been configured for a different VLAN. During implementation of the Junos Pulse Access Control Service, you must configure a RADIUS return attribute policy to apply a role representing a group of authenticated users that frequently transport their laptops from building to building and floor to floor. In the admin GUI, which policy element would you enable to accommodate these users?（）
    A

    Add Session-Timeout attribute with value equal to the session lifetime

    B

    Add Termination-Action attribute with value equal 1

    C

    VLAN

    D

    Open port


    正确答案： B
    解析： 暂无解析

  • 第23题：

    单选题
    Which statement is true regarding the COALESCE function?（）
    A

    It can have a maximum of five expressions in a list 

    B

    It returns the highest NOT NULL value in the list for all rows 

    C

    It requires that all expressions in the list must be of the same data type 

    D

    It requires that at least one of the expressions in the list must have a NOT NULL value


    正确答案： B
    解析： 暂无解析

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