super(name, baseSalary);
this.commission = commission;
super();this.commission = commission;
this.commission = commission;super();
super(name, baseSalary);this.commission = commission;
this.commission = commission;super(name, baseSalary);
super(name, baseSalary, commission);
第1题：
A.foreach（x）System.out.println（z）；
B.for（intz：x）System.out.println（z）；
C.while（x.hasNext（））System.out.println（x.next（））；
D.for（inti=0；i
第2题：
A.public void m1() { }
B.protected void m1() { }
C.private void m1() { }
D.void m2() { }
E.public void m2() { }
F.protected void m2() { }
G.private void m2() { }
第3题：
A.SELECT last_name，12*salary* commission_pct FROM emp
B.SELECT last_name，12*salary*（commission_pct，0）FROM emp
C.SELECT last_name，12*salary*（nvl（commission_pct，0））FROM emp如果oracle第一个参数为空那么显示第二个参数的值，如果第一个参数的值不为空，则显示第一个参数本来的值
D.SELECT last_name，12*salary*（decode（commission_pct，0））FROM emp
第4题：
Click the Exhibit button and examine the data from the EMP table.The COMMISSION column shows the monthly commission earned by the employee.Which two tasks would require subqueries or joins in order to be performed in a single step? （）
A.listing the employees who earn the same amount of commission as employee 3
B.finding the total commission earned by the employees in department 10
C.finding the number of employees who earn a commission that is higher than the average commission of the company
D.listing the departments whose average commission is more than 600
E.listing the employees who do not earn commission and who are working for department 20 in descending order of the employee ID
F.listing the employees whose annual commission is more than 6000
第5题：
The EMPLOYEE tables has these columns:LAST_NAME VARCHAR2(35)SALARY NUMBER(8,2)COMMISSION_PCT NUMBER(5,2)You want to display the name and annual salary multiplied by the commission_pct for all employees. For records that have a NULL commission_pct, a zero must be displayed against the calculated column.Which SQL statement displays the desired results? （）
A. SELECT last_name, (salary * 12) * commission_pct FROM EMPLOYEES;
B. SELECT last_name, (salary * 12) * IFNULL(commission_pct, 0) FROM EMPLOYEES;
C. SELECT last_name, (salary * 12) * NVL2(commission_pct, 0) FROM EMPLOYEES;
D. SELECT last_name, (salary * 12) * NVL(commission_pct, 0) FROM EMPLOYEES;
第6题：
1.publicclassEmployee{2.Stringname；3.doublebaseSalary；4.Employee（Stringname，doublebaseSalary）{5.this.name=name；6.this.baseSalary=baseSalary；7.}8.}And：1.publicclassSalespersonextendsEmployee{2.doublecommission；3.publicSalesperson（Stringname，doublebaseSalary，4.doublecommission）{5.//insertcodehere6.}7.}Whichcode，insertedatline7，completestheSalespersonconstructor？（）
A.this.commission=commission；
B.superb（）；commission=commission；
C.this.commission=commission；superb（）；
D.super（name，baseSalary）；this.commission=commission；
E.super（）；this.commission=commission；
F.this.commission=commission；super（name，baseSalary）；
第7题：
The EMPLOYEES table contains these columns:LAST_NAME VARCHAR2 (25)SALARY NUMBER (6,2)COMMISSION_PCT NUMBER (6)You need to write a query that will produce these results:1. Display the salary multiplied by the commission_pct.2. Exclude employees with a zero commission_pct.3. Display a zero for employees with a null commission value. Evaluate the SQL statement:SELECT LAST_NAME, SALARY*COMMISSION_PCT FROM EMPLOYEESWHERE COMMISSION_PCT IS NOT NULL;What does the statement provide? （）
A. All of the desired results
B. Two of the desired results
C. One of the desired results
D. An error statement
第8题：
A.super（name，baseSalary）；
B.this.commission=commission；
C.super（）；this.commission=commission；
D.this.commission=commission；super（）；
E.super（name，baseSalary）；this.commission=commission；
F.this.commission=commission；super（name，baseSalary）；
G.super（name，baseSalary，commission）；
第9题：
Examine the data from the EMP table:The COMMISSION column shows the monthly commission earned by the employee.Which three tasks would require subqueries or joins in order to perform in a single step?（）
A. Deleting the records of employees who do not earn commission.
B. Increasing the commission of employee 3 by the average commission earned in department 20.
C. Finding the number of employees who do NOT earn commission and are working for department 20.
D. Inserting into the table a new employee 10 who works for department 20 and earns a commission that is equal to the commission earned by employee 3.
E. Creating a table called COMMISSION that has the same structure and data as the columns EMP_ID and COMMISSIONS of the EMP table.
F. Decreasing the commission by 150 for the employees who are working in department 30 and earning a commission of more then 800.
第10题：
1. public class Employee { 2. String name； 3. double baseSalary； 4. Employee（String name， double baseSalary） { 5. this.name = name； 6. this.baseSalary = baseSalary； 7. } 8. } And： 1. public class Salesperson extends Employee { 2. double commission； 3. public Salesperson（String name， double baseSalary， 4. double commission） { 5. // insert code here 6. } 7. } Which code， inserted at line 7， completes the Salesperson constructor？（）