你可能感興趣的試題

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.

多項選擇題

The ORDERS table has these columns:
ORDER_ID NUMBER(4) NOT NULL
CUSTOMER_ID NUMBER(12) NOT NULL
ORDER_TOTAL NUMBER(10,2)
The ORDERS table tracks the Order number, the order total, and the customer to whom the Order belongs. Which two statements retrieve orders with an inclusive total that ranges between 100.00 and 2000.00 dollars? （）

A. SELECT customer_id, order_id, order_total FROM orders RANGE ON order _ total (100 AND 2000) INCLUSIVE;
B. SELECT customer_id, order_id, order_total FROM orders HAVING order _ total BETWEEN 100 and 2000;
C. SELECT customer_id, order_id, order_total FROM orders WHERE order _ total BETWEEN 100 and 2000;
D. SELECT customer_id, order_id, order_total FROM orders WHERE order_total>= 100 and <= 2000;
E. SELECT customer_id, order_id, order_total FROM orders WHERE order_total>= 100 and order_total <= 2000;