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What type of constraint is used to ensure that each row inserted into the EMPLOYEE table with a value in the WORKDEPT column has a row with a corresponding value in the DEPTNO column of the DEPARTMENT table?()A.A check constraint on the EMPLOYEE tableB.A

题目

What type of constraint is used to ensure that each row inserted into the EMPLOYEE table with a value in the WORKDEPT column has a row with a corresponding value in the DEPTNO column of the DEPARTMENT table?()

A.A check constraint on the EMPLOYEE table

B.A unique constraint on the EMPLOYEE table WORKDEPT column

C.A foreign key reference from the DEPARTMENT tables DEPTNO column to the WORKDEPT column of the EMPLOYEE table

D.A foreign key reference from the EMPLOYEE tables WORKDEPT column to the DEPTNO column of the DEPARTMENT table


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  • 第1题:

    健康计划的总体目标中的三个"W"指

    A、who,what,when

    B、what,when,why

    C、who,what,which

    D、what,when,where

    E、when,where,which


    参考答案:A

  • 第2题:

    【填空题】删除“供货商表”的“联系电话”字段。 必须先删除该字段上的默认电话、“电话约束”惟一约束。代码如下: USE diannaoxs ______ TABLE 供货商表 ______ constraint 电话约束


    AC

  • 第3题:

    查找引⽤函数的搜索查找范围是由()参数指定的。

    A.Table_array

    B.Index_number

    C.Row_number

    D.Range_lookup


    Table_array

  • 第4题:

    健康计划的总体目标中的三个“W”指

    A:what,when,where

    B:who,what,when

    C:when,where,which

    D:who,what,which

    E:what,when,why


    正确答案:B
    解析:总体目标的三个“W”分别指who-对象;what-实现什么变化;when-实现变化的期限。

  • 第5题:

    1、现在需要对xml文档中所有的chapter元素排序后再利用for-each进行循环,要求排序依据为chapter下名为“no”的子元素,且按数值类型进行排序。能实现该功能的选项为()。

    A.<for-each select="//chapter"> <sort data-type="number" select="//no" /> </for-each>###SXB###B.<for-each select="//chapter"> <sort data-type="number" select="/no" /> </for-each>###SXB###C.<for-each select="/chapter"> <sort data-type="number" select="no" /> </for-each>###SXB###D.<for-each select="
    正确的格式;格式正确

  • 第6题:

    现在需要对xml文档中所有的chapter元素排序后再利用for-each进行循环,要求排序依据为chapter下名为“no”的子元素,且按数值类型进行排序。能实现该功能的选项为()。

    A.<for-each select="//chapter"> <sort data-type="number" select="//no" /> </for-each>

    B.<for-each select="//chapter"> <sort data-type="number" select="/no" /> </for-each>

    C.<for-each select="/chapter"> <sort data-type="number" select="no" /> </for-each>

    D.<for-each select="//chapter"> <sort data-type="number" select="no" /> </for-each>


    结构