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1、 双(原据数库理 卷试)语数据库原理(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(方计算机科学与技术2007级 向): 闭卷笔试 考试方式及要求: 总分五四题 号 三二一 得 分 阅卷人 分,将答案填在下表内)分,共一、单项选择题(每题240 10 2 1 7 8 6 5 9 4 3 题号 答案 20 17 18 14 15 16 19 11 12 13 题号 答案1. Physical data independence(物理数据独立性)( ) A Allows us to access(访问) the physical data indep
2、endently(独立地) from all applications(应用程序) B Allows us to rewrite(重写) the queries(查询) on the database without affecting(影响) the physical data C Allows us to physically reorganize(重新组织) the data in the database without affecting the applications running on the database D All of the above 2. Which of t
3、he following is NOT an advantage(优点) of database ) (systems? A Redundant data(冗余的数据) B Program-data independence(应用程序与数据相互独立) C Better data quality (更好的数据质量) D Reduced 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)? ( ) A The grade a
4、ssigned(分配) to a student for a course must be either an A, B, C, D or F B Every course must have a unique(唯一的) value for its course number C The name of any student must be less than 30 characters(字母) in length D All of the above 4. Customers(顾客), cars, and parts(零件) are examples of ( ) A entities(实
5、体) Battributes(属性) Crelations Drelationships(联系) 5. A(n) _ is the relationship between a weak entity type and its owner. ( ) A weak relationship B identifying(识别) relationship C non-identifying(非识别) relationship D owner relationship 6. The relational data model(关系数据模型) consists of(由组成) ) ()? 组件which
6、 components(A Data structure(数据结构) B Data manipulation(数据操作) C Data integrity (完整性约束) D All of the above 7. A primary key that consists of more than one attribute is called a( ) A foreign key(外键) B composite key(复合键) C multivalued key(多值键) D candidate key(候选键) 8. A rule that states that each foreign
7、 key value must match a primary key value in the other relation is called the( ) A referential integrity constraint(参照完整性约束) B entity integrity constraint(实体完整性约束) C domain integrity constraint(域完整性约束) D null constraint(空值约束) 9. Which of the following are anomalies(异常) that can be caused by redundan
8、cies(冗余) in tables? ( ) A insertion(插入) B deletion(删除) (修改) modificationCD all of the above 10. A candidate key(候选键) must satisfy(满足) all of the following conditions EXCEPT(除了)( ) A the key must uniquely(唯一地) identify(识别) the row B the key must indicate the rows position in the table(表明行在表中的位置) C th
9、e key must be nonredundant(非冗余的) D each nonprime attribute(非主属性) is functionally 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 RS B R(RS) C RS D all of the above 12. This operation is commutative(可交换的) ( ) A Union(并) B Intersection(
10、交) ) 笛卡尔积 Cartesian product(CD all of the above 13. What does the following SQL statement do? ( ) Alter Table Customer_T Add (Type Varchar (2); A Alters the Customer_T table to accept Type 2 Varchars B Alters the Customer_T table to be a Type 2 Varchar C Alters the Customer_T table, and adds a field
11、 called Type D Alters the Customer_T table by adding a 2-byte field called Varchar 14. What does the following SQL statement do? ( ) Update Product_T Set Unit_Price = 775 Where Product_ID = 7 A Changes the price of a unit called Product_T to 7 B Changes the unit price of Product 7 to 775 C Changes t
12、he length of the Unit_Price field to 775 D Updates the Product_T table to have a unit price of 775 15. Assume(假设) we have executed(执行) the following CREATE TABLE statement: CREATE TABLE Emp ( Ssn CHAR(9) Primary Key; SuperSsn CHAR(9) REFERENCES EMP(Ssn) ; Which of the following could be used to inse
13、rt(插入) the first row into the Emp table? ( ) ) INSERT INTO Emp(Ssn) VALUES (123456789 AB INSERT INTO Emp(Ssn, SuperSsn) VALUES (123456789, 987654321) C INSERT INTO Emp(SuperSsn) VALUES (987654321) D all of the above 16. _ is a set of commands(命令) used to update and query a database. ( ) A DML B DDL
14、C DCL D DPL 17. In an SQL statement, which of the following finds all groups meeting stated conditions(符合条件的组)? ( ) A Select B Where C Having D Find 18. To eliminate duplicate rows(消除重复行) in a query, the _ qualifier(限定符) is used in the SQL Select command. ( ) A alter distinct BC check D specific 19.
15、 _ takes a value of true if a subquery(子查询) returns an intermediate results(中间结果) table which contains(包含) one or more rows. ( ) A In B Having C Exists D Extents 20. A _is a temporary table(临时表) used in the FROM clause(子句) of an SQL query. ( ) A correlated subquery(相关子查询) B derived table(导出表) C view
16、 table(视图表) D None of the above 二、判断题(每题1分,共10分,正确的填T,错误的填F,将答案填在下表内) 题1 2 3 4 5 6 7 8 9 号答 案10 1. We can define(定义) a relation schema(关系模式) R(A1, A2, A3) where A1 is the primary key(主键) and A3 is a foreign key(外键) that refers to(参考) R.( ) 2. A constraint(约束) is a rule in a database system that can
17、be violated(违反) by users. ( ) 3. The E-R model is used to construct(构建) a conceptual model(概念模型). ( ) 4. The entity integrity rule(实体完整性规则)states that a primary key attribute can be null. ( ) 5. The attribute value in a tuple(元组) that makes up(组成) a foreign key(外键) can be null. ( ) 6. A composite ke
18、y(复合键) consists of only one attribute. ( ) 7. One property(特征) of a relation is that each attribute within a relation has a unique(唯一的) name. ( ) 8. The columns of a relation can be interchanged(交换) without changing the meaning or use of the relation. ( ) a table from 9. The DELETE SQL command is us
19、ed to remove(去掉) )the database. ( )( Subqueries10. (子查询) can only be used in the WHERE clause. 15分)三、操作题(每题3分,共 现有关系数据库模式如下: )学生(学号,姓名,性别,专业,年龄 )(课程课程号,名称,学分 学号,课程号,分数)学习( 小题。5实现3语言用关系代数表达式实现12小题,用T-SQL 查询“学生”关系学生中都有哪些专业。1. 分的所有学生的学号、姓名、90检索“数据库原理”课程成绩高于2. 专业和分数。 3. 检索没有选修课程号为“C135”课程的学生信息,包括学号,姓名和专业。 4. 从“学生”关系中删除成绩出现过0分的所有学生信息。 5. 定义“英语”专业学生所学课程的信息视图English_View,包括学号、姓名、课程
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