Review the definition of the phone_list view.CHEATE OR REPLACE ALGORITHM=MERGE DEFINER= ‘root‘@localhost‘ SQL SECURITY DEFINER VIEW ‘phone_list‘ AS SELECTe . 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
第1题:
第2题:
5、有A和B两个公共列的数据框,如何用merge()函数按A数据框将A,B两个数据框合并
A.merge(A,B,all=T)
B.merge(A,B,all.x=T)
C.merge(A,B,all.y=T)
D.cbind(A,B)
第3题:
有A和B两个公共列的数据框,如何用merge()函数按A数据框将A,B两个数据框合并
A.merge(A,B,all=T)
B.merge(A,B,all.x=T)
C.merge(A,B,all.y=T)
D.cbind(A,B)
第4题:
增加Review数量和提高Review评级可以实现广告优化。
第5题:
5、下面代码用于打开一个SummaryFragment对象,请补充完整: SummaryFragment f = new SummaryFragment(); FragmentManager manger = getSupportFragmentManager(); manger.beginTransaction().replace(R.id.layoutContent, ).commit();
第6题:
以下哪一个菜单命令可以用来合并场景文件?
A.Merge(合并)
B.Open(打开)
C.Export(导入)
D.Replace(替换)