吉大14春《数据库应用技术》在线作业答案
吉大14春《数据库应用技术》在线作业一试卷总分：100 测试时间：--
一、单选题（共25道试题，共100分。）
1.事务的原子性是指（）
A. 事务中包含的所有操作要么都做，要么都不做
B. 事务一旦提交，对数据库的改变是永久性的
C. 一个事务内部的操作及使用的数据对并发的其他事务是隔离的
D. 事务必须是使数据库从一个一致性状态变到另一个一致性状态
满分：4分
2.游标稳定性（CS，或称光标稳定性）隔离级锁定工作单元期间光标所在的任何行。对该行的锁定将（）
A. . 不保持
B. . 保持到取出下一行记录或整个工作单元终止。
C. . 保持到整个工作单元终止。
满分：4分
3.If a stored procedure returns multiple rows, which of the following must the calling application use to access the result set
A. A cursor
B. A select statement
C. A declared temporary table
D. A table user-defined function
满分：4分
4.对于UNIX和Intel平台上的数据库应用，如果需要存取OS/400、VM/VSE和OS/390系统上的数据库，需要DB2哪种产品的支持？
A. DB2 Connect
B. DB2 DataPropagator
C. DB2 Net.Data
D. DB2 DataJoiner
E. DB2 Relational Connect
满分：4分
5.Which of the following privileges is required to successfully execute a Java stored procedure that uses JDBC to update several different tables
A. The user must have UPDATE privilege on the referenced tables.
B. The developer must have EXECUTE privilege on the stored procedure.
C. The user must have UPDATE privilege on the referenced tables and EXECUTE privilege on the stored procedure.
D. The developer must have UPDATE privilege on the referenced tables and EXECUTE privilege on the stored procedure.
满分：4分
6.下列哪种工具可以向表中增添记录，并更改数据库的统计信息？
A. import
B. insert
C. load
D. update
满分：4分
7.向基本表增加一个新列后，原有元组在该列上的值为什么？
A. TRUE
B. FALSE
C. 空值
D. 不确定
满分：4分
8.Given the tables: EMPLOYEE DEPT emp_num emp_name dept dept_id dept_name 1 Adams 1 1 Planning 2 Jones 1 2 Support 3 Smith 2 4 Williams 1 and the statement: ALTER TABLE employee ADD FOREIGN KEY (dept) REFERENCES dept (dept_id) ON DELETE CASCADE How many rows will be deleted when the following statement is executed DELETE FROM employee WHERE dept=1
A. 0
B. 1
C. 3
D. 4
满分：4分
9.Which of the following cursor definitions will define a cursor called c2 that will fetch rows from table t2, and for every row fetched will update column c1 in table t2
A. DECLARE c2 CURSOR FOR SELECT * FROM t2 FOR UPDATE OF t2
B. DECLARE c2 CURSOR FOR SELECT * FROM t2 FOR UPDATE OF c2
C. DECLARE c2 CURSOR FOR SELECT * FROM t2 FOR UPDATE OF c1
D. DECLARE c2 CURSOR WITH HOLD FOR SELECT * FROM t2 FOR UPDATE OF t2
满分：4分
10.Which of the following is TRUE for all cursors defined as FOR FETCH ONLY
A. The cursors are unambiguous.
B. Only the first row is returned.
C. Cursor stays open after a commit.
D. A temporary table is created on the server.
满分：4分
11.下列SQL语句中，能够实现“收回用户U4对学生表（STUD）中学号（XH）的修改权”这一功能的是（）
A. REVOKE UPDATE(XH) ON TABLE FROM U4
B. REVOKE UPDATE(XH) ON TABLE FROM PUBLIC
C. REVOKE UPDATE(XH) ON STUD FROM U4
D. REVOKE UPDATE(XH) ON STUD FROM PUBLIC
满分：4分
12.使用SQL语句进行查询操作时，若希望查询结果不出现重复元组，应在SELECT子句中使用什么保留字？
A. NIQUE
B. ALL
C. EXCEPT
D. DISTINCT
满分：4分
13.下面哪个工具可以帮助用户对语句性能进行分析？
A. 可视化解释工具
B. 性能监视器
C. 命令行处理器
D. 控制中心
满分：4分
14.据库系统和文件系统的主要区别是：
A. 数据库系统复杂，而文件系统简单。
B. 文件系统不能解决数据冗余和数据独立性问题，而数据库系统可以解决。
C. 文件系统只能管理程序文件，而数据库系统能够管理各种类型的文件。
D. 文件系统管理的数据量较少，而数据库系统可以管理庞大的数据量。
满分：4分
15.如果需要创建一个表，并把表中的索引数据和其他数据分开存储，则应该
A. 建立两个SMS表空间分别存储索引数据和其他数据
B. 建立两个DMS表空间分别存储索引数据和其他数据
C. 建立一个DMS表空间存储索引数据，再建立一个SMS表空间存储其他数据
D. 建立一个SMS表空间存储索引数据，再建立一个DMS表空间存储其他数据
满分：4分
16.关系模式中各级模式之间的关系为（）
A. 3NF 2NF 1NF
B. 3NF 1NF 2NF
C. 1NF 2NF 3NF
D. 2NF 1NF 3NF
满分：4分
17.如果开发人员在AIX操作系统上开发访问后台AS400上的DB2数据库，则需要在AIX开发环境中安装：（）
A. DB2个人开发版（PDE）
B. DB2通用开发版（UDE）
满分：4分
18.Given the expression: WITH most_cities AS ( SELECT b.id,b.name,a.cities FROM country a, staff b WHERE a.person = b.id AND cities > :threshold ) SELECT * FROM most_cities In which of the following does MOST_CITIES exist
A. user tables
B. server memory
C. user table space
D. system catalog tables
满分：4分
19.DBMS是（）
A. 操作系统的一部分
B. 在操作系统支持下的系统软件
C. 一种编译程序
D. 应用程序系统
满分：4分
20.Which of the following CLI/ODBC functions should be used to delete rows from a DB2 table
A. SQLDelete()
B. SQLExecDirect()
C. SQLBulkDelete()
D. SQLExecuteUpdate()
满分：4分
21.An ODBC/CLI application performs an array insert into a table containing a primary key. If one of the values inserted generates a duplicate row error, which of the following APIs can be called to determine the failing row
A. SQLError()
B. SQLNumRows()
C. SQLRowCount()
D. SQLGetDiagField()
满分：4分
22.嵌入式SQL语句中引用共享变量时，必须在变量名前加什么标志？
A. 号
B. 分号
C. 句号
D. 冒号
满分：4分
23.使用DROP语句撤消基本表时，使用以下哪个子句，可以将下属的视图和约束引用全部撤消？
A. NULL
B. RESTRICT
C. CASCADE
D. DISTINCT
满分：4分
24.Given the table T1 containing an INTEGER column: C1 --- 1 A multithreaded ODBC/CLI application successfully executes the following pseudocode in sequence: Thread 1:SQLConnect(hDbc1,"CERTDB",SQL_NTS,"",NULL,"",NULL); Thread 2:SQLConnect(hDbc2,"CERTDB",SQL_NTS,"",NULL,"",NULL); Thread 1: SQLSetConnectAttr( hDbc1, SQL_ATTR_AUTOCOMMIT, SQL_AUTOCOMMIT_ON); Thread 2: SQLSetConnectAttr( hDbc2, SQL_ATTR_AUTOCOMMIT, SQL_AUTOCOMMIT_ON); Thread1:SQLA11ocHandle(SQL_HANDLE_STMT,hDbc1,&hStmt1); Thread2:SQLA11ocHandle(SQL_HANDLE_STMT,hDbc2,&hStmt2); Thread 1: SQLExecDirect( hStmt1, "SAVEPOINT sp1 ON ROLLBACK RETAIN CURSORS",SQL_NTS); Thread 1:SQLExecDirect(hStmt,"INSERT INTO T1 VALUES(2)",SQL_NTS); Thread 2: SQLExecDirect( hStmt2, "SAVEPOINT sp1 ON ROLLBACK RETAIN CURSORS",SQL_NTS); Thread2:SQLExecDirect(hStmt2,"INSERT INTO T1 VALUES(3)",SQL_NTS); Thread1:SQLExecDirect(hStmt1,"INSERT INTO T1 VALUES(4)",SQL_NTS); Thread2:SQLExecDirect(hStmt2,"ROLLARBACK TO SAVEPOINT spl",SQL_NTS); Thread2:SQLExecDirect(hStmt2,"INSERT INTO T1 VALUES(4)",SQL_NTS); Which result set would be returned by: Thread 2: SQLExecDirect( hStmt2, "SELECT c1 FROM t1 ORDER BY C1", SQL_NTS );
A. 1,5
B. 1,2,5
C. 1,2,4,5
D. 1,2,3,4
满分：4分
25.Given the application code: EXEC SQL DECLARE cur CURSOR WITH HOLD FOR SELECT c1 FROM t1 EXEC SQL OPEN cur EXEC SQL FETCH cur INTO :hv /* Statement 1 */ EXEC SQL COMMIT /* Statement 2 */ EXEC SQL FETCH cur INTO :hv /* Statement 3 */ EXEC SQL ROLLBACK /* Statement 4 */ EXEC SQL CLOSE cur /* Statement 5 */ If the table T1 has no rows in it, which statement will cause the cursor "cur" to be closed first
A. Statement 1
B. Statement 2
C. Statement 3
D. Statement 4
吉大《数据库应用技术》在线作业二
试卷总分：100 测试时间：--
一、单选题（共25道试题，共100分。）
1.下面哪个工具可以帮助用户对语句性能进行分析？
A. 可视化解释工具
B. 性能监视器
C. 命令行处理器
D. 控制中心
满分：4分
2.使用SQL语句进行查询操作时，若希望查询结果不出现重复元组，应在SELECT子句中使用什么保留字？
A. NIQUE
B. ALL
C. EXCEPT
D. DISTINCT
满分：4分
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. 正确
B. 错误
满分：4分
4.Which of the following privileges is required to successfully execute a Java stored procedure that uses JDBC to update several different tables
A. The user must have UPDATE privilege on the referenced tables.
B. The developer must have EXECUTE privilege on the stored procedure.
C. The user must have UPDATE privilege on the referenced tables and EXECUTE privilege on the stored procedure.
D. The developer must have UPDATE privilege on the referenced tables and EXECUTE privilege on the stored procedure.
满分：4分
5.下列哪种工具可以向表中增添记录，并更改数据库的统计信息？
A. import
B. insert
C. load
D. update
满分：4分
6.对于支持小规模的部门级应用，这些应用不需要存取驻留在OS/400、OS/390等平台上的远程数据库，则需要哪种级别的DB2 产品？
A. 企业版
B. 工作组版
C. 企业扩展版
D. 个人版
E. 卫星版
F. 微型版
满分：4分
7.Given the tables, the relationships and the statements: EMPLOYEE DEPT emp_num emp_name dept dept_id dept_name 1 Adams 1 1 Planning 2 Jones 1 2 Support 3 Smith 2 4 Williams 1 Relationship: employee.dept is a foreign key on dept.dept_id. stmt="INSERT INTO employee VALUES (5,'jones',3)"; EXEC SQL EXECUTE IMMEDIATE :stmt; stmt="INSERT INTO employee VALUES (6,'jhonson',2)'; EXEC SQL EXECUTE IMMEDIATE :stmt; How many rows are successfully inserted
A. One row is inserted in EMPLOYEE
B. No rows are inserted in EMPLOYEE
C. Two rows are inserted in EMPLOYEE
D. One row is inserted in DEPT and 2 rows are inserted in EMPLOYEE
满分：4分
8.Given the tables T1 and T2 with INTEGER columns: T1 COL1 ----------- 1- 1- 22 T2 COL1 ----------- 1- 2- 22 and the following statement that executes successfully: DELETE FROM t1 WHERE col1 IN (SELECT * FROM t2) How many rows will be left in T1 after running this statement
A. 0
B. 2
C. 3
D. 6
满分：4分
9.Given the table T1 containing an INTEGER column: C1 --- 1 A multithreaded ODBC/CLI application successfully executes the following pseudocode in sequence: Thread 1:SQLConnect(hDbc1,"CERTDB",SQL_NTS,"",NULL,"",NULL); Thread 2:SQLConnect(hDbc2,"CERTDB",SQL_NTS,"",NULL,"",NULL); Thread 1: SQLSetConnectAttr( hDbc1, SQL_ATTR_AUTOCOMMIT, SQL_AUTOCOMMIT_ON); Thread 2: SQLSetConnectAttr( hDbc2, SQL_ATTR_AUTOCOMMIT, SQL_AUTOCOMMIT_ON); Thread1:SQLA11ocHandle(SQL_HANDLE_STMT,hDbc1,&hStmt1); Thread2:SQLA11ocHandle(SQL_HANDLE_STMT,hDbc2,&hStmt2); Thread 1: SQLExecDirect( hStmt1, "SAVEPOINT sp1 ON ROLLBACK RETAIN CURSORS",SQL_NTS); Thread 1:SQLExecDirect(hStmt,"INSERT INTO T1 VALUES(2)",SQL_NTS); Thread 2: SQLExecDirect( hStmt2, "SAVEPOINT sp1 ON ROLLBACK RETAIN CURSORS",SQL_NTS); Thread2:SQLExecDirect(hStmt2,"INSERT INTO T1 VALUES(3)",SQL_NTS); Thread1:SQLExecDirect(hStmt1,"INSERT INTO T1 VALUES(4)",SQL_NTS); Thread2:SQLExecDirect(hStmt2,"ROLLARBACK TO SAVEPOINT spl",SQL_NTS); Thread2:SQLExecDirect(hStmt2,"INSERT INTO T1 VALUES(4)",SQL_NTS); Which result set would be returned by: Thread 2: SQLExecDirect( hStmt2, "SELECT c1 FROM t1 ORDER BY C1", SQL_NTS );
A. 1,5
B. 1,2,5
C. 1,2,4,5
D. 1,2,3,4
满分：4分
10.如果需要创建一个表，并把表中的索引数据和其他数据分开存储，则应该
A. 建立两个SMS表空间分别存储索引数据和其他数据
B. 建立两个DMS表空间分别存储索引数据和其他数据
C. 建立一个DMS表空间存储索引数据，再建立一个SMS表空间存储其他数据
D. 建立一个SMS表空间存储索引数据，再建立一个DMS表空间存储其他数据
满分：4分
11.A cursor is declared with the WITH HOLD option. Which of the following statements is always true
A. The cursor will remain open after a COMMIT.
B. All rows retrieved are locked until a COMMIT.
C. A COMMIT will not be allowed until the cursor is closed.
D. Locks obtained by the cursor will be kept after a COMMIT.
满分：4分
12.并发控制的主要方法是采用以下哪种机制？
A. 口令
B. 锁
C. 副本
D. 检查点
满分：4分
13.如果用户在SQL语句中没有指定数据库对象的SCHEMA，则其缺省的SCHEMA是：
A. SYSIBM
B. SYSCAT
C. SYSSTAT
D. 该用户连接到数据库时所使用的用户名
E. 以上都不对
满分：4分
14.DBMS是（）
A. 操作系统的一部分
B. 在操作系统支持下的系统软件
C. 一种编译程序
D. 应用程序系统
满分：4分
15.Given the tables T1 and T2, each with an INTEGER column: T1 COL1 ----------- 1- 1- 22 T2 COL1 ----------- 1- 2- 22 and the following query that executes successfully: SELECT * FROM T1 LEFT OUTER JOIN T2 ON T1.COL1=T2.COL1 How many rows will the query return
A. 5
B. 6
C. 10
D. 36
满分：4分
16.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. NULL
B. NOT NULL
C. DISTINCT
D. UNIQUE
满分：4分
17.If a stored procedure returns multiple rows, which of the following must the calling application use to access the result set
A. A cursor
B. A select statement
C. A declared temporary table
D. A table user-defined function
满分：4分
18.给定三个表：学生表S，课程表C和学生选课表SC，它们的结构分别如下： S（S#，SN，SEX，AGE，DEPT） C（C#，CN） SC（S#，C#，GRADE）其中：S#为学号，SN为姓名，SEX为性别，AGE为年龄，DEPT为系别，C#为课程 号，CN为课程名，GRADE为成绩。 对表SC建立如下视图： CREATE VIEW S_GRADE(S#,C_NUM,AVG_GRADE) AS SELECT S#,COUNT(C#),AVG(GRADE) FROM SC GROUP BY S#; 判断下面查询是否允许执行，如允许，写出转换到基本表SC上的操作。 SELECT S#，C_NUM FROM S_GRADE WHERE AVG_GRADE>80
A. 不允许查询。因为视图中使用了分组和聚合函数。
B. 允许。对应的操作为： SELECT S#，COUNT（C#） FROM SC WHERE AVG(GRADE)>80
C. 允许。对应的操作为： SELECT S#,COUNT(C#) FROM SC GROUP BY S# HAVING AVG(GRADE)>80
D. 允许。对应的操作为： SELECT S#, COUNT(C#) FROM SC HAVING AVG(GRADE)>80
满分：4分
19.数据库系统的并发控制的主要方法是采用（）制。
A. 拒绝
B. 改为串行
C. 锁
D. 不加任何控制
满分：4分
20.Which of the following CLI/ODBC functions should be used to delete rows from a DB2 table
A. SQLDelete()
B. SQLExecDirect()
C. SQLBulkDelete()
D. SQLExecuteUpdate()
满分：4分
21.Given the table called NAME with the following column and data: lname ------ Smith SMITH SmiTh smith Which of the following SQL statements will return all four rows in upper case
A. SELECT CAPS(lname) FROM name
B. SELECT UCASE(lname) FROM name
C. SELECT STRUPR(lname) FROM name
D. SELECT TOUPPER(lname) FROM name
满分：4分
22.Given the table T1 with the following data: COL1 IDX ---- ---- A single-threaded CLI application executes the following pseudocode in sequence: SQLAllocHandle( SQL_HANDLE_ENV, NULL, &hEnv ) SQLAllocHandle( SQL_HANDLE_DBC, hEnv, &hDbc ) SQLConnect( hDbc, "SAMPLE", SQL_NTS, NULL, SQL_NTS, NULL, SQL_NTS ) SQLSetConnectAttr( hDbc, SQL_ATTR_AUTOCOMMIT, SQL_AUTOCOMMIT_ON ) SQLAllocHandle( SQL_HANDLE_STMT, hDbc, &hStmt ) SQLExecDirect( hStmt, "UPDATE table1 SET col1=10 WHERE idx=1", SQL_NTS ) SQLExecDirect( hStmt, "UPDATE table1 SET col1=20 WHERE idx=2", SQL_NTS ) SQLEndTran( SQL_HANDLE_DBC, hDbc, SQL_COMMIT ) SQLExecDirect( hStmt, "UPDATE table1 SET col1=30 WHERE idx=1", SQL_NTS ) SQLExecDirect( hStmt, "UPDATE table1 SET col1=40 WHERE idx=1", SQL_NTS ) SQLEndTran( SQL_HANDLE_DBC, hDbc, SQL_ROLLBACK ) SQLExecDirect( hStmt, "SELECT col1 FROM table1 WHERE idx=1", SQL_NTS ) Which of the following values for COL1 will be fetched when the sequence for the pseudocode listed above is successfully executed
A. 10
B. 20
C. 30
D. 40
满分：4分
23.Which of the following is TRUE for all cursors defined as FOR FETCH ONLY
A. The cursors are unambiguous.
B. Only the first row is returned.
C. Cursor stays open after a commit.
D. A temporary table is created on the server.
满分：4分
24.Which of the following is a benefit of user-defined functions
A. Improves application concurrency
B. Improves blocking of result sets
C. Simplifies application maintenance
D. Reduces memory requirements on the server
满分：4分
25.Which of the following database resources can be freed when a unit of work is committed
A. row locks
B. cursor names
C. buffer pools
D. cursors WITH HOLD
满分：4分
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