單項(xiàng)選擇題
Review the definition of the phone_list view.
CHEATE OR REPLACE ALGORITHM=MERGE DEFINER= 'root'@localhost' SQL SECURITY DEFINER VIEW 'phone_list' AS SELECT
e . id as id 'e . first_name AS 'first_name' 'e . last_name AS 'last_name' 'coalesce ( ph1.phone_no, ' – ') AS 'office_no' 'coalesce (ph2 .phone_no, ' – ') AS 'cell_no' FROM employees e LEFT JOIN employee_phone ph1 ON ph1.emp_id = e.id AND ph1.type = 'office' LEFT JOIN employee_phone ph2 ON ph2 .emp_id = e.id AND ph2 .type = 'mobile'
The tables employees and employee_phone are InnoDB tables;
all columns are used in this view. The contents of the phone_list view are as follows: Mysql> select * from phone_list; 1 row in set (0.00 sec)
Which method can you use to change the cell_no value to '555-8888' for John Doe?（）
A.INSERT INTO employee_phone (emp_id, phone_no, type) VALUES (1, '555-8888','mobile')
B.UPDATE phone_list SET cell_name '555-8888' WHERE first_name= 'John' and last_name= 'Doe'
C.DELETE FROM phone_list WHERE first_name= 'John' and last_name= 'Doe'; INSERT INTO phone_list (first_name, last_name, office_no, cell_no) VALUES ('John' , 'Doe' , 'x1234' , '555-8888)
D.UPDATE employee_phone SET phone_no= '555-8888' where emp_id=1
