以下SQL99语句描述的是(26)。 CREATETYPE Employee( Name String, ssn integer); CREATE TYPE Manager UNDER Employee( Degree String, Dept String);A．关联关系B．嵌套关系C．继承类型D．聚集关系
以下SQL99语句描述的是(26)。 CREATETYPE Employee( Name String, ssn integer); CREATE TYPE Manager UNDER Employee( Degree String, Dept String);
A．关联关系
B．嵌套关系
C．继承类型
D．聚集关系
相关考题：
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You created a view called EMP_DEPT_VU that contains three columns from the EMPLOYEES and DEPARTMENTS tables:EMPLOYEE_ID, EMPLOYEE_NAME AND DEPARTMENT_NAME.The DEPARTMENT_ID column of the EMPLOYEES table is the foreign key to the primary keyDEPARTMENT_ID column of the DEPARTMENTS table.You want to modify the view by adding a fourth column, MANAGER_ID of NUMBER data type from the EMPLOYEES tables.How can you accomplish this task? （）A. ALTER VIEW EMP_dept_vu (ADD manger_id NUMBER);B. MODIFY VIEW EMP_dept_vu (ADD manger_id NUMBER);C. ALTER VIEW emp_dept_vu AS SELECT employee_id, employee_name, department_name, manager_id FROM employee e, departments d WHERE e.department _ id = d.department_id;D. MODIFY VIEW emp_dept_vu AS SELECT employee_id, employee_name, department_name, manager_id FROM employees e, departments d WHERE e.department _ id = d.department_id;E. CREATE OR REPLACE VIEW emp_dept_vu AS SELECT employee_id, employee_name, department_name, manager_id FROM employees e, departments d WHERE e.department _ id = d.department_id;F. You must remove the existing view first, and then run the CREATE VIEW command with a new column list to modify a view.
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public class Employee{ private String name； public Employee（String name）{ this.name = name； } public String getName（）{ return name； } } public class Manager extends Employee{ private String department； public Manager（String name，String department）{ this.department = department； super（name）； （应于上一行掉位置） System.out.println（getName（））； } } Super的位置是否在方法的首行 执行语句new Manager（“smith”，”SALES”）后程序的输出是哪项？（）A、 smithB、 nullC、 SALESD、 编译错误
public class Employee{ private String name； public Employee（String name）{ this.name = name； } public void display（）{ System.out.print（name）； } } public class Manager extends Employee{ private String department； public Manager（String name，String department）{ super（name）； this.department = department； } public void display（）{ System.out.println（super.display（）+”，”+department）； } } 执行语句new Manager（“smith”，”SALES”）后程序的输出是哪项？（） A、 smith，SALESB、 null，SALESC、 smith，nullD、 null，nullE、 编译错误
public class Employee{ private String name； public Employee（String name）{ this.name = name； } public String getName（）{ return name； } } public class Manager extends Employee{ private String department； public Manager（String name，String department）{ this.department = department； super（name）； System.out.println（getName（））； } } 执行语句new Manager（“smith”，”SALES”）后程序的输出是哪项？（） A、 smithB、 nullC、 SALESD、 编译错误
public class Employee{ private String name； public Employee（String name）{ this.name = name； } public void display（）{ System.out.print（name）； } } public class Manager extends Employee{ private String department； public Manager（String name，String department）{ super（name）； this.department = department； } public void display（）{ System.out.println（ super.display（）+”，”+department）； } } 执行语句new Manager（“smith”，”SALES”）后程序的输出是哪项？（） A、 smith，SALESB、 null，SALESC、 smith，nullD、 null，null
11. class Person { 12. String name = “No name‟； 13. public Person（String nm） { name = nm； } 14. } 15. 16. class Employee extends Person { 17. String emplD = “0000”； 18. public Employee（String id） { empID = id； } 19. } 20. 21. public class EmployeeTest { 22. public static void main（String[] args） { 23. Employee e = new Employee（”4321”）； 24. System.out.println（e.empID）； 25. } 26. } What is the result？（） A、 4321B、 0000C、 An exception is thrown at runtime.D、 Compilation fails because of an error in line 18.
public class Employee{ private String name； public Employee（String name）{ this.name = name； } public String getName（）{ return name； } } public class Manager extends Employee{ public Manager（String name）{ System.out.println（getName（））； } } 执行语句new Manager（“smith”）后程序的输出是哪项？（） A、 smithB、 nullC、 编译错误D、 name
You created a view called EMP_DEPT_VU that contains three columns from the EMPLOYEES and DEPARTMENTS tables: EMPLOYEE_ID, EMPLOYEE_NAME AND DEPARTMENT_NAME. The DEPARTMENT_ID column of the EMPLOYEES table is the foreign key to the primary key DEPARTMENT_ID column of the DEPARTMENTS table. You want to modify the view by adding a fourth column, MANAGER_ID of NUMBER data type from the EMPLOYEES tables. How can you accomplish this task?（）A、ALTER VIEW emp_dept_vu (ADD manager_id NUMBER);B、MODIFY VIEW emp_dept_vu (ADD manager_id NUMBER);C、ALTER VIEW emp_dept_vu AS SELECT employee_id, employee_name, department_name, manager_id FROM employee e, departments d WHERE e.department_id = d.department_id;D、MODIFY VIEW emp_dept_vu AS SELECT employee_id, employee_name, department_name, manager_id FROM employees e, departments d WHERE e.department_id = d.department_id;E、CREATE OR REPLACE VIEW emp_dept_vu AS SELECT employee_id, employee_name, department_name, manager_id FROM employees e, departments d WHERE e.department_id = d.department_id;F、You must remove the existing view first, and then run the CREATE VIEW command with a new column list to modify a view.
单选题public class Employee{ private String name； public Employee（String name）{ this.name = name； } public void display（）{ System.out.print（name）； } } public class Manager extends Employee{ private String department； public Manager（String name，String department）{ super（name）； this.department = department； } public void display（）{ System.out.println（super.display（）+”，”+department）； } } 执行语句new Manager（“smith”，”SALES”）后程序的输出是哪项？（）A smith，SALESB null，SALESC smith，nullD null，nullE 编译错误
单选题public class Employee{ private String name； public Employee（String name）{ this.name = name； } public String getName（）{ return name； } } public class Manager extends Employee{ public Manager（String name）{ System.out.println（getName（））； } } 执行语句new Manager（“smith”）后程序的输出是哪项？（）A smithB nullC 编译错误D name