OCP-1Z0-051-2015-19题

Examine the structure of the EMPLOYEES table:



You want to create a SQL script file that contains an INSERT statement. When the script is run,

the INSERT statement should insert a row with the specified values into the EMPLOYEES table.
The INSERT statement should pass values to the table columns as specified below:



Which INSERT statement meets the above requirements?

A. INSERT INTO employees

VALUES (emp_id_seq.NEXTVAL, '&ename', '&jobid', 2000, NULL, &did);

B. INSERT INTO employees

VALUES (emp_id_seq.NEXTVAL, '&ename', '&jobid',2000, NULL, &did IN (20,50));

C. INSERT INTO (SELECT *

FROM employees

WHERE department_id IN (20,50))

VALUES (emp_id_seq.NEXTVAL, '&ename', '&jobid', 2000, NULL, &did);

D. INSERT INTO (SELECT *

FROM employees

WHERE department_id IN (20,50)

WITH CHECK OPTION)

VALUES (emp_id_seq.NEXTVAL, '&ename', '&jobid', 2000, NULL, &did);

E. INSERT INTO (SELECT *

FROM employees

WHERE (department_id = 20 AND

department_id = 50)

WITH CHECK OPTION )
VALUES (emp_id_seq.NEXTVAL, '&ename', '&jobid', 2000, NULL, &did);

Answer: D

Explanation:在EMPLOYEES 表中插入一条语句，首先字段1  employee_id为自增需要.nextval;字段5 department_id为20或者50所以需要department_id IN (20,50) WITH CHECK OPTION

Using the WITH CHECK OPTION Clause: Example The following statement is legal even though
the third value inserted violates the condition of the subquery 

where_clause

:

with check option可以这么解释：通过视图进行的修改，必须也能通过该视图看到修改后的结果。比如你insert，那么加的这条记录在刷新视图后必须可以看到；如果修改，修改完的结果也必须能通过该视图看到；如果删除，当然只能删除视图里有显示的记录。