当前位置:国家开放大学(数据库基础与应用)题库

问题:

[单选] 设一个关系为R(A,B,C,D,E),它的最小函数依赖集为FD={A→B,A→C,C→D,C→E},若要规范化为第三范式,则被分解后的关系个数为()。

A . 1
B . 2
C . 3
D . 4

缢索沟呈现() 水平圆环状。 马蹄形,八字不交状。 下深上浅的皮肤压痕。 深浅均匀的皮肤压痕。 锁骨骨折。 新进矿山的井下职工,矿山企业应当组织对其进行安全教育、培训,下矿井工作前至少必须接受()h的安全教育、培训。 72。 60。 40。 You are the administrator of a Windows Server 2003 computer named Server1. Newly hired employees recently started storing files on Server1. Now users report that Server1 is responding much slower than it did before the additional users were added. You suspect the disk subsystem needs to be upgraded to accommodate the additional user load. You need to confirm whether the disk subsystem on Server1 needs to be upgraded. What should you do?() Configure a Performance Logs and Alerts alert on the %Free Space counter.。 Use Device Manager to populate volume settings and examine the properties of the disk drives on Server1。 Use Event Viewer to examine the system logs and search the system logs for events generated by the disk event source.。 Use System Monitor to monitor counters based on the PhysicalDisk object.。 You develop a service application that needs to be deployed. Your network administrator creates a specific user account for your service application.You need to configure your service application to run in the context of this specific user account. What should you do?() Prior to installation,set the StartType property of the ServiceInstaller class.。 Prior to installation,set the Account,Username,and Password properties of theServiceProcessInstaller class.。 Use the CONFIG option of the net.exe command-line tool to install the service.。 Use the installutil.exe command-line tool to install the service.。 在风险相同、收益相同并且时间分布相同的情况下,利润大小决定了方案对企业价值的贡献。 设一个关系为R(A,B,C,D,E),它的最小函数依赖集为FD={A→B,A→C,C→D,C→E},若要规范化为第三范式,则被分解后的关系个数为()。
参考答案:

  参考解析

本题暂无解析

在线 客服