文档介绍：装 订 线
班级： 学号： 姓名：
考试科目： 数据库系统 考试时间：120分钟 试卷总分100分
考试班级：软件06-1、2、3、4、5、6班
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I、Choice questions. (Write your answers onto the answer sheet.)(There are 10 questions, totally 20 marks, and each question worth 2 marks.）
The relationship among Database (DB), Database System (DBS) and Database Management System (DBMS) is ___A_____.
A. “DBS includes DB and DBMS” B. “DBMS includes DB and DBS”
C. “DB includes DBS and DBMS” D. “DB is DBS, also as DBMS”
In an index, ___A_____ is the attribute to set of attributes used to look up records in a file.
A. search key B. structured key
C. sequence key D. select key
A _____D___ of an entity set is a set of one or more attributes whose values uniquely determine each entity.
A. key B. primary key
C. candidate key D. super key
From the following physical storage media, ____D___ is VOLATILE.
A. optical storage B. tape storage
C. magnetic-disk D. main memory
Choose the only one INCORRECT description from the followings: __D_____
A. Neither tuples nor attributes have order.
B. Attributes can appear in any order and the relation is still the same.
C. Each value in the database must be a member of some domain.
D. Duplicate tuples can exist in a relation.