《数据库原理(双语)》试卷word精品文档6页.doc
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1、如有侵权,请联系网站删除,仅供学习与交流数据库原理(双语)试卷【精品文档】第 5 页数据库原理(双语)考试试卷(第一套)课程号5807605040考试时间100分钟适用专业年级(方向):计算机科学与技术2007级考试方式及要求:闭卷笔试题号一二三四五总分得分阅卷人一、单项选择题(每题2分,共40分,将答案填在下表内)题号12345678910答案题号11121314151617181920答案1. Physical data independence(物理数据独立性)( )AAllows us to access(访问) the physical data independently(独立地)
2、 from all applications(应用程序)BAllows us to rewrite(重写) the queries(查询) on the database without affecting(影响) the physical dataCAllows us to physically reorganize(重新组织) the data in the database without affecting the applications running on the databaseDAll of the above2. Which of the following is NOT
3、an advantage(优点) of database systems? ( )ARedundant data(冗余的数据) BProgram-data independence(应用程序与数据相互独立) CBetter data quality (更好的数据质量)DReduced program maintenance(减少应用程序维护)3. Which of the following is an example of a database integrity constraint(完整性约束条件)? ( )AThe grade assigned(分配) to a student for
4、 a course must be either an A, B, C, D or FBEvery course must have a unique(唯一的) value for its course number CThe name of any student must be less than 30 characters(字母) in lengthDAll of the above4. Customers(顾客), cars, and parts(零件) are examples of ( )Aentities(实体) Battributes(属性) Crelations Drelat
5、ionships(联系) 5. A(n) _ is the relationship between a weak entity type and its owner. ( ) Aweak relationship B identifying(识别) relationship Cnon-identifying(非识别) relationship Downer relationship6. The relational data model(关系数据模型) consists of(由组成) which components(组件)? ( )AData structure(数据结构) BData
6、manipulation(数据操作)CData integrity (完整性约束)DAll of the above 7. A primary key that consists of more than one attribute is called a( ) Aforeign key(外键)Bcomposite key(复合键)Cmultivalued key(多值键)Dcandidate key(候选键)8. A rule that states that each foreign key value must match a primary key value in the other
7、 relation is called the( )Areferential integrity constraint(参照完整性约束)Bentity integrity constraint(实体完整性约束)Cdomain integrity constraint(域完整性约束)Dnull constraint(空值约束)9. Which of the following are anomalies(异常) that can be caused by redundancies(冗余) in tables? ( )Ainsertion(插入) Bdeletion(删除) Cmodificati
8、on(修改) Dall of the above 10. A candidate key(候选键) must satisfy(满足) all of the following conditions EXCEPT(除了)( )Athe key must uniquely(唯一地) identify(识别) the row Bthe key must indicate the rows position in the table(表明行在表中的位置)Cthe key must be nonredundant(非冗余的)Deach nonprime attribute(非主属性) is functi
9、onally dependent upon(函数依赖于) it. 11. The intersection(交集) of two relations R(A,B,C) and S(A,B,C) can be computed by( )A RSBR(RS)C RSD all of the above12. This operation is commutative(可交换的) ( )A Union(并)B Intersection(交)C Cartesian product(笛卡尔积)D all of the above13. What does the following SQL state
10、ment do? ( )Alter Table Customer_T Add (Type Varchar (2);AAlters the Customer_T table to accept Type 2 VarcharsBAlters the Customer_T table to be a Type 2 VarcharCAlters the Customer_T table, and adds a field called TypeDAlters the Customer_T table by adding a 2-byte field called Varchar14. What doe
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