[单选]
Examine the structure of the EMPLOYEES and NEW_EMPLOYEES tables: EMPLOYEES
EMPLOYEE_ID NUMBER Primary Key
FIRST_NAME VARCHAR2 (25)
LAST_NAME VARCHAR2 (25)
HIRE_DATE DATE
NEW EMPLOYEES
EMPLOYEE_ID NUMBER Primary Key
NAME VARCHAR2 (60)
Which DELETE statement is valid? （）

A . DELETE FROM employees WHERE employee_id = (SELECT employee_id FROM employees);
B . DELETE * FROM employees WHERE employee_id = (SELECT employee_id FROM new_ employees);
C . DELETE FROM employees WHERE employee_id IN (SELECT employee_id FROM new_employees WHERE name = ('Carrey')'
D . DELETE * FROM employees WHERE employee_id IN (SELECT employee_id FROM new_employees WHERE last_ name = ('Carrey')'

依照法定程序，确认企业的法人资格或营业资格，必须进行企业登记注册。戴维•哈威认为资本的运动过程是怎样的。 In which two aspects does hot patching differ from conventional patching?（） It consumes more memory compared with conventional patching.。 It can be installed and uninstalled via OPatch unlike conventional patching.。 It takes more time to install or uninstall compared with conventional patching.。 It does not require down time to apply or remove unlike conventional patching.。 It is not persistent across instance startup and shutdown unlike conventional patching.。 Note the following functionalities of various background processes： 1. Record the checkpoint information in data file headers. 2. Perform recovery at instance startup. 3. Cleanup unused temporary segments. 4. Free the resources used by a user process when it fails. 5. Dynamically register database services with listeners. 6. Monitor sessions for idle session timeout. Which option has the correct functionalities listed for a background process（） Archiver Process （ARCn）： 1， 2， 5。 System Monitor Process （SMON）： 1， 4， 5。 Process Monitor Process （PMON）： 4， 5， 6。 Database Writer Process （DBWn）： 1， 3， 4。桌面系统管理为什么强调正版的使用（）完善的售后服务和较小的安全风险。国家要求正版化。性价比很高。能获得及时的升级。

Examine the structure of the EMPLOYEES and NEW_EMPLOYEES tables: EMPLOYEES
EMPLOYEE_ID NUMBER Primary Key
FIRST_NAME VARCHAR2 (25)
LAST_NAME VARCHAR2 (25)
HIRE_DATE DATE
NEW EMPLOYEES
EMPLOYEE_ID NUMBER Primary Key
NAME VARCHAR2 (60)
Which DELETE statement is valid? （）

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[单选] Examine the structure of the EMPLOYEES and NEW_EMPLOYEES tables: EMPLOYEES EMPLOYEE_ID NUMBER Primary Key FIRST_NAME VARCHAR2 (25) LAST_NAME VARCHAR2 (25) HIRE_DATE DATE NEW EMPLOYEES EMPLOYEE_ID NUMBER Primary Key NAME VARCHAR2 (60) Which DELETE statement is valid? （）

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[单选]
Examine the structure of the EMPLOYEES and NEW_EMPLOYEES tables: EMPLOYEES
EMPLOYEE_ID NUMBER Primary Key
FIRST_NAME VARCHAR2 (25)
LAST_NAME VARCHAR2 (25)
HIRE_DATE DATE
NEW EMPLOYEES
EMPLOYEE_ID NUMBER Primary Key
NAME VARCHAR2 (60)
Which DELETE statement is valid? （）