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? （） ALTER VIEW EMP_dept_vu (ADD manger_id NUMBER);。 MODIFY VIEW EMP_dept_vu (ADD manger_id NUMBER);。 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;。 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;。 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;。 You must remove the existing view first, and then run the CREATE VIEW command with a new column list to modify a view.。
知识产权通常包括（）。 专利权。 商誉。 商标权。 版权。
电力电缆寻找故障点时，一般先烧穿故障点，烧穿时，宜采用（）。 直流。 交流。 交直流。
下面霉菌孢子中（）不是无性孢子 分生孢子。 子囊孢子。 孢囊孢子。 节孢子。
If two windows overlap， which window attribute will determine whether one should be chosen over the other？（） WINDOW_PRIORITY。 PRIORITY。 PRIORITY_LEVEL。 WINDOW_PRIORITY_LEVEL。 OVERLAP_RULE。
单位工程投入使用验收的主要工作包括（）。
