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选择题练习

1．实体完整性规则是指关系中D

A．元组值不允许为空B．属性值不允许为空

C．外码值不允许为空D．主属性值不允许为空

2．数据库的概念模型D

A．依赖于计算机硬件和DBMSB．独立于计算机硬件，依赖于DBMS C．依赖于计算机硬件，独立于DBMSD．独立于计算机硬件和DBMS 3．E-R模型设计属于数据库的A

A．概念设计B．逻辑设计

C．物理设计D．程序设计

4．在数据库系统的三级模式之间，提供两层映象的作用是提高D A．数据的一致性B．操作的可行性

C．数据的完整性D．数据的独立性

5．数据模型的三个要素中，用于描述系统静态特性的是B

A．数据操作B．数据结构

C．数据完整性约束D．数据参照

6．下列关于关系性质的说法中，错误的是D

A．列名不能相同B．列是同质的

C．列的顺序无关紧要D．不同列不能有相同的域

7．对数据库中全体数据逻辑结构和特征的描述称为C

A．外模式B．内模式

C．模式D．存储模式

8．数据模型用来表示实体间的联系，在常用的数据模型中不包括C A．关系模型B．层次模型

C．链状模型D．网状模型

9．用二维表来表示实体及实体之间联系的数据模型称为D

A．实体-联系模型B．层次模型

C．网状模型D．关系模型

10．下列不属于数据库维护任务的是C

A．建立数据库和装载数据B．数据库的安全性、完整性控制C．数据库性能的监督、分析和改进D．数据库的重组织和重构造11．下列关于数据库系统的叙述中正确的是A

A．数据库系统减少了数据冗余

B．数据库系统避免了一切冗余

C．数据库系统中数据的一致性是指数据类型一致

D．数据库系统比文件系统能管理更多的数据

12．规定职工工资调整不得低于其原来工资，这种约束属于B A．静态列级约束B．动态列级约束

C．静态元组约束D．动态元组约束

13．在数据库技术中，未提交的随后又被撤消的数据称为D

A．错误数据B．冗余数据

C．过期数据D．脏数据

14．对数据库模式进行规范化处理，是在数据库设计的C

A．需求分析阶段B．概念设计阶段

C．逻辑设计阶段D．物理设计阶段

15．在分布式数据库系统中，用户不必关心数据分布的细节，这种性质称为D

A．分片透明性B．位置透明性

C．定位透明性D．分布透明性

16．在下列SQL语句中，属于数据控制的语句是C A．DELETE，ALTERB．UPDATE，INSERT

C．GRANT，REVOKED．CREATE，DROP

17．下列属于小型数据库系统的是A

A．FoxproB．Oracle

C．InformixD．Sybase

18．一个事务的执行不被其他事务干扰，这一特性是指事务的C A．原子性B．一致性

C．隔离性D．持久性

19．数据库系统在运行过程中，由于某种硬件故障，使存储在外存上的数据部分损失或全部损失，这类故障属于D

A．事务故障B．系统故障

C．计算机病毒D．介质故障

20．在WWW上访问和传送网页的协议是C

A．FTPB．HTML

C．HTTPD．XML

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