[单选]
Examine the structure of the EMPLOYEES and DEPARTMENTS tables:
EMPLOYEES
EMPLOYEE_ID NUMBER
DEPARTMENT_ID NUMBER
MANAGER_ID NUMBER
LAST_NAME VARCHAR2(25)
DEPARTMENTS
DEPARTMENT_ID NUMBER
MANAGER_ID NUMBER
DEPARTMENT_NAME VARCHAR2(35)
LOCATION_ID NUMBER
You want to create a report displaying employee last names, department names, and locations. Which query should you use?（）

A . SELECT e.last_name, d. department_name, d.location_id FROM employees e NATURAL JOIN departments D USING department_id ;
B . SELECT last_name, department_name, location_id FROM employees NATURAL JOIN departments WHERE e.department_id =d.department_id;
C . SELECT e.last_name, d.department_name, d.location_id FROM employees e NATURAL JOIN departments d;
D . SELECT e.last_name, d.department_name, d.location_id FROM employees e JOIN departments d USING (department_id )

下列与合作意识不一致的是（）。相互支持。共同协作。共同发展。各自为阵。 Which of the following CRS upgrades are allowed?（） CRS 2.2 to CRS 3.5 。 CRS 3.1 to CRS 4.0 。 CRS 2.2 to CRS 4.0 。 CRS 3.5 to CRS 4.0 。 CRS 4.0 to CRS 3.0 。 CRS 2.1 to CRS 4.0。执行Command的ExecuteScalar方法得到的是结果集中的第2行第2列。用直流电桥测量开关的接触电阻时，电桥指示的电阻随时间的增大而（）。增加。不变。减小。 Examine the following command:ALTER SYSTEM SET enable_ddl_logging=FALSE;Which statement is true?（） None of the data definition language (DDL) statements are logged in the trace file.。 Only DDL commands that resulted in errors are logged in the alert log file.。 A new log.xml file that contains the DDL statements is created, and the DDL command details are removed from the alert log file.。 Only DDL commands that resulted in the creation of new database files are logged.。

Examine the structure of the EMPLOYEES and DEPARTMENTS tables:
EMPLOYEES
EMPLOYEE_ID NUMBER
DEPARTMENT_ID NUMBER
MANAGER_ID NUMBER
LAST_NAME VARCHAR2(25)
DEPARTMENTS
DEPARTMENT_ID NUMBER
MANAGER_ID NUMBER
DEPARTMENT_NAME VARCHAR2(35)
LOCATION_ID NUMBER
You want to create a report displaying employee last names, department names, and locations. Which query should you use?（）

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