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When defining a referential constraint between the parent table T2 and the dependent table T1, which of the following is true?()A.The list of column names in the FOREIGN KEY clause can be a subset of the list of column names in the primary key of T2 or a

题目
When defining a referential constraint between the parent table T2 and the dependent table T1, which of the following is true?()

A.The list of column names in the FOREIGN KEY clause can be a subset of the list of column names in the primary key of T2 or a UNIQUE constraint that exists on T2.

B.The list of column names in the FOREIGN KEY clause can be a subset of the list of column names in the primary key of T1 or a UNIQUE constraint that exists on T1.

C.The list of column names in the FOREIGN KEY clause must be identical to the list of column names in the primary key of T2 or a UNIQUE constraint that exists on T2.

D.The list of column names in the FOREIGN KEY clause must be identical to the list of column names in the primary key of T1 or a UNIQUE constraint that exists on T1.


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参考答案和解析
参考答案:C
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  • 第1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2题:

    如果TABLE为数据段中0032单元的符号名,其中存放的内容为1234H,当执行指令”MOV AX,TABLE”和”LEA AX,TABLE”后,(AX)中的内容分别为多少?

    A.执行MOV AX , TABLE后(AX)=1234H

    B.执行LEA AX, TABLE 后 (AX)=0032H.

    C.执行MOV AX , TABLE后(AX)=0032H

    D.执行LEA AX, TABLE 后 (AX)=1234H


    1234H,0032H

  • 第3题:

    要创建一个1行2列的表格,下面语句正确的是:

    A.<table> <td> <tr>单元格1</tr> <tr>单元格2</tr> </td> </table>

    B.<table> <tr> <td>单元格1</td> <td>单元格2</td> </tr> </table>

    C.able> <tr> <td>单元格1</td> </tr> <tr> <td>单元格2</td> </tr> </table>

    D.<table> <tr> <t1>单元格1</t1> <t2>单元格2</t2> </tr> </table>


    value = (1,)

  • 第4题:

    4、要创建一个1行2列的表格,下面语句正确的是()

    A.<TABLE> <TD> <TR>单元格1</TR> <TR>单元格2</TR> </TD> </TABLE>

    B.<TABLE> <TR><TD>单元格1</TD><TD>单元格2</TD></TR> </TABLE>

    C.<TABLE> <TR><TD>单元格1</TD></TR> <TR><TD>单元格2</TD></TR> </TABLE>

    D.<TABLE> <TR> <T1>单元格1</T1> <T2>单元格2</T2> </TD> &


    单元格1 单元格2

  • 第5题:

    要创建一个1行2列的表格,下面语句正确的是()

    A.<TABLE> <TD> <TR>单元格1</TR> <TR>单元格2</TR> </TD> </TABLE>

    B.<TABLE> <TR><TD>单元格1</TD><TD>单元格2</TD></TR> </TABLE>

    C.<TABLE> <TR><TD>单元格1</TD></TR> <TR><TD>单元格2</TD></TR> </TABLE>

    D.<TABLE> <TR> <T1>单元格1</T1> <T2>单元格2</T2> </TD> &


    单元格1 单元格2

  • 第6题:

    21、要创建一个1行2列的表格,下面语句正确的是()

    A.<TABLE> <TD> <TR>单元格1</TR> <TR>单元格2</TR> </TD> </TABLE>

    B.<TABLE> <TR><TD>单元格1</TD><TD>单元格2</TD></TR> </TABLE>

    C.<TABLE> <TR><TD>单元格1</TD></TR> <TR><TD>单元格2</TD></TR> </TABLE>

    D.<TABLE> <TR> <T1>单元格1</T1> <T2>单元格2</T2> </TD> &


    单元格1 单元格2