吉大20年4月《数据库应用技术》作业考核试题-0001
试卷总分:100 得分:100
一、单选题 (共 25 道试题,共 100 分)
1.How many rows can be retrieved using a single SELECT INTO statement?
A.Only one row
B.As many as host variable array structures can hold
C.As many as are in the result
D.As many as are host variables used in the call
答案:A
2.在数据库中存储的是：（）
A.数据模型
B.数据以及数据之间的联系
C.数据
D.信息
答案:B
3.在语句CREATE VIEW EMP_VIEW2 (EMPNO, EMPNAME, DEPTNO, JOBTITLE, HIREDATE) AS SELECT ID, NAME, DEPT, JOB, HIREDATE FROM EMPLOYEE WHERE DEPT=10 WITH CHECK OPTION; 所定义的视图中，当使用INSERT语句时，若新增的行中DEPTNO数值不为10，则该行将被拒绝插入。
A.错误
B.正确
答案:B
4.下面哪个工具可以帮助用户对语句性能进行分析？
A.控制中心
B.性能监视器
C.命令行处理器
D.可视化解释工具
答案:D
5.定义基本表时，若要求某一列的值不能为空，则应在定义时使用什么保留字？但如果该列是主键，则可省写。
A.UNIQUE
B.NULL
C.NOT NULL
D.DISTINCT
答案:C
6.Given an ODBC/CLI program with a single connection, two threads and the following actions which complete successfully: Thread 1: INSERT INTO mytab VALUES (1) Thread 2: INSERT INTO mytab VALUES (2) Thread 1: COMMIT Thread 2: INSERT INTO mytab VALUES (3) Thread 1: ROLLBACK Thread 2: COMMIT How many records will be inserted and retained in the table MYTAB?
