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The EMP table has some discrepancy in data entry with a particular employee ID. You execute the query as shown in the Exhibit to retrieve all versions of the row that exist between two SCNs.View the Exhibit.Which two statements about the results of the qu

题目

The EMP table has some discrepancy in data entry with a particular employee ID. You execute the query as shown in the Exhibit to retrieve all versions of the row that exist between two SCNs.View the Exhibit.Which two statements about the results of the query shown in the Exhibit are correct?（）

A. The LAST_SCN value in the first row is NULL, which means that the versions of the row still exist at SCN 6636300. LAST_SCN

B. The LAST_SCN value in the second row in NULL, which means that the version of the row still exists at SCN 6636300.

C. The LAST_SCN value in the third row is 6636280, which means that the version of row exists above SCN 6636280.

D. The LAST_SCN value in the second row is NULL, which means that the version of the row no longer exists because it was deleted. LAST_SCN

相似考题

1.How long() you() a member of the club?A.have,,joinedB.have,,beenC.has,,joinedD.has,,been

2.Evaluate this SQL statement:SELECT e.employee_id, (.15* e.salary) + (.5 * e.commission_pct) + (s.sales amount * (.35 * e.bonus)) AS CALC_VALUEFROM employees e, sales sWHERE e.employee_id = s.emp_id;What will happen if you remove all the parentheses from the calculation? （）A. The value displayed in the CALC_VALUE column will be lower.B. The value displayed in the CALC_VALUE column will be higher.C. There will be no difference in the value displayed in the CALC_VALUE column.D. An error will be reported.

3.阅读以下说明C++代码，将应填入(n)处的字句写在对应栏内。[说明]本程序实现了雇员信息管理功能，其中封装了雇员信息及其设置、修改、删除操作。已知当输入为“Smith 31 2960.0”时，程序的输出是：姓名：Smith 年龄：31 工资：2960姓名：Smith 年龄：31 工资：3500姓名：Mary 年龄：23 工资：2500[C++程序]include ＜iostream.h＞include ＜string.h＞class employee{char *name; //雇员姓名short age; //年龄float salary;//工资public:employee();void set_name(char *);void set_age(short a) {age=a;}void set_salary(float s) {salary=s;}(1);~ employee(){delete[] name;}};employee::employee() { name="";age=0;salary=0.0;void employee::set_name(char *n){ name=new char[strlen(n)+1];(2) (name,n);}void employee::print(){ cout＜＜"姓名":"＜＜name＜＜" 年龄:"＜＜agc＜＜" 工资:" ＜＜salary＜＜endl;}void main(){ char *na;short ag=0;float sa=0;(3);na=new char[10];cin＞＞na＞＞ag＞＞sa;emp.set_name(na);emp.set_age(ag);emp.set_salary(sa);emp.print();(4) (3500.0);emp.print();(5);emp.set_name("Mary");emp.set_age(23);emp.set_salary(2500.0);emp.print();}

4.下列程序的运行结果是【 】。 include class SomeClass { public: SomeClass(int va下列程序的运行结果是【 】。include ＜iostream. h＞class SomeClass{public:SomeClass(int value) { some_value=value;};void show_data(void) { cout＜＜data＜＜"＜＜~some_value＜＜endl; };static void set_data(int value) {data=value; }private:static int data;int some_value};int SomeClass::datavoid main(void){SomeClass my_class(1001),your_class(2002);your_class. set_data(4004);my_elass. show_data()}

参考答案和解析
参考答案：A, D
更多“The EMP table has some discrepancy in data entry with a particular employee ID. You execut ”相关问题

  • 第1题：

    Examine the structure of the EMPLOYEES table:EMPLOYEE_ID NUMBER Primary KeyFIRST_NAME VARCHAR2(25)LAST_NAME VARCHAR2(25)HIRE_DATE DATEYou issue these statements:CREATE table new_emp ( employee_id NUMBER, name VARCHAR2(30));INSERT INTO new_emp SELECT employee_id , last_name from employees;Savepoint s1;UPDATE new_emp set name = UPPER(name);Savepoint s2;Delete from new_emp;Rollback to s2;Delete from new_emp where employee_id =180;UPDATE new_emp set name = ‘James‘;Rollback to s2;UPDATE new_emp set name = ‘James‘ WHERE employee_id =180;Rollback;At the end of this transaction, what is true?（）

    A.You have no rows in the table.

    B.You have an employee with the name of James.

    C.You cannot roll back to the same savepoint more than once.

    D.Your last update fails to update any rows because employee ID 180 was already deleted.


    参考答案：A

  • 第2题：

    Evaluate this SQL statement:e.employee_id, (.15* e.salary) + (.5 * e.commission_pct)+ (s.sales_amount * (.35 * e.bonus)) AS CALC_VALUEFROM employees e, sales sWHERE e.employee_id = s.emp_id;What will happen if you remove all the parentheses from the calculation?（）

    A.The value displayed in the CALC_VALUE column will be lower.

    B.The value displayed in the CALC_VALUE column will be higher.

    C.There will be no difference in the value displayed in the CALC_VALUE column.

    D.An error will be reported.


    参考答案：C

  • 第3题：

    There currently seems to be a large____between the number of people employed in service industries, and those employed in the primary sector.

    A.different
    B.differential
    C.discrimination
    D.discrepancy

    答案：B
    解析：
    本题横线处需要一个名词。选项A是形容词，意为“不同的”。选项B既有名词词性，也有形容词词性。作名词时，意为“微分；差别”；作形容词时，意为“微分；差别”。选项C是名词，意为“歧视，区别”。选项D是名词，意为“矛盾；不符”。题目意为“目前，服务业就业人数与初级部门就业人数之间存在很大差别。”
    　　

  • 第4题：

    Click the Exhibit button to examine the data of the EMPLOYEES table. Evaluate this SQL statement:SELECT e.employee_id "Emp_id", e.emp_name "Employee", e.salary, m.employee_id "Mgr_id", m.emp_name "Manager"FROM employees e JOIN employees m ON (e.mgr_id = m.employee_id)AND e.salary > 4000;What is its output?（）

    A.A

    B.B

    C.C

    D.D

    E.E


    参考答案：A

  • 第5题：

    Click the Exhibit button to examine the data of the EMPLOYEES table.Which statement lists the ID, name, and salary of the employee, and the ID and name of the employee‘s manager, for all the employees who have a manager and earn more than 4000?（）

    A.SELECT employee_id "Emp_id", emp_name "Employee", salary, employee_id "Mgr_id", emp_name "Manager" FROM employees WHERE salary > 4000;

    B.SELECT e.employee_id "Emp_id", e.emp_name "Employee", e.salary, m.employee_id "Mgr_id", m.emp_name "Manager" FROM employees e JOIN employees m WHERE e.mgr_id = m.mgr_id AND e.salary > 4000;

    C.SELECT e.employee_id "Emp_id", e.emp_name "Employee", e.salary, m.employee_id "Mgr_id", m.emp_name "Manager" FROM employees e JOIN employees m ON (e.mgr_id = m.employee_id) AND e.salary > 4000;

    D.SELECT e.employee_id "Emp_id", e.emp_name "Employee", e.salary, m.mgr_id "Mgr_id", m.emp_name "Manager" FROM employees e SELF JOIN employees m WHERE e.mgr_id = m.employee_id AND e.salary > 4000;

    E.SELECT e.employee_id "Emp_id", e.emp_name "Employee", e.salary, m.mgr_id "Mgr_id" m.emp_name "Manager" FROM employees e JOIN employees m USING (e.employee_id = m.employee_id) AND e.salary > 4000;


    参考答案：C

  • 第6题：

    Most operating systems have a standard set of ( ) to handle the processing of all input and output instructions.

    A.spreadsheet
    B.control instructions
    C. I/O operation
    D.datA.table

    答案：B
    解析：
    翻译：

    大多数操作系统都有一套标准的（71）处理所有的输入和输出指令。

    A. 电子表格 B. 控制指令

    C. I/O操作 D. 数据表

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