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【单选题】

Which statement describes the PFE?（）

A、The PFE controls the RE by providing Layer 2 and Layer 3 forwarding tables

B、The PFE implements advanced services such as policing, stateless firewall filtering, and class of service

C、The PFE sends traffic to the RE for systematic packet forwarding

D、The PFE receives hardware and environmental status messages from the RE

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第1题
[] Evaluate these two SQL statements: SELECT last_name, salary , hire_date FROM EMPLOYEES ORDER BY salary DESC; SELECT last_name, salary, hire_date FROM EMPLOYEES ORDER BY 2 DESC; What is true about them? （） Evaluate these two SQL statements: SELECT last_name, salary , hire_date FROM EMPLOYEES ORDER BY salary DESC; SELECT last_name, salary, hire_date FROM EMPLOYEES ORDER BY 2 DESC; What is true about them? （）

A、A. The two statements produce identical results.  B、B. The second statement returns a syntax error.  C、C. There is no need to specify DESC because the results are sorted in descending order by default.  D、D. The two statements can be made to produce identical results by adding a column alias for the salary column in the second SQL statement.  

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第2题
[单选题] Evaluate these two SQL statements:SELECT last_name, salary, hire_dateFROM EMPLOYEES ORDRE BY salary DESC; SELECT last_name, salary, hire_dateFROM EMPOLYEES ORDER BY 2 DESC; What is true about them?（）

A、The two statements produce identical results.  B、The second statement returns a syntax error.  C、There is no need to specify DESC because the results are sorted in descending order by default.  D、The two statements can be made to produce identical results by adding a column alias for the salary column in the second SQL statement.  

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第3题
[单选题] Evaluate these two SQL statements: SELECT last_name, salary, hire_dateFROM EMPLOYEES ORDRE BY salary DESC; SELECT last_name, salary, hire_dateFROM EMPOLYEES ORDER BY 2 DESC; What is true about them? （）

A、The two statements produce identical results.  B、The second statement returns a syntax error.  C、There is no need to specify DESC because the results are sorted in descending order by default.  D、The two statements can be made to produce identical results by adding a column alias for the salary column in the second SQL statement.  

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第4题
[单选题] Evaluate these two SQL statements: SELECT last_name, salary , hire_date FROM EMPLOYEES ORDER BY salary DESC; SELECT last_name, salary , hire_date FROM EMPLOYEESORDER BY 2 DESC; What is true about them?（）

A、The two statements produce identical results.  B、The second statement returns a syntax error.  C、There is no need to specify DESC because the results are sorted in descending order by default.  D、The two statements can be made to produce identical results by adding a column alias for the salary column in the second SQL statement.  

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第5题
[单选题] Evaluate these two SQL statements: SELECT last_name, salary , hire_date FROM EMPLOYEES ORDER BY salary DESC; SELECT last_name, salary , hire_date FROM EMPLOYEES ORDER BY 2 DESC; What is true about them?（）

A、The two statements produce identical results.  B、The second statement returns a syntax error.  C、There is no need to specify DESC because the results are sorted in descending order by default.  D、The two statements can be made to produce identical results by adding a column alias for the salary column in the second SQL statement.  

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第6题
[单选题] Evaluate these two SQL statements: SELECT last_name, salary , hire_date FROM EMPLOYEES ORDER BY salary DESC; SELECT last_name, salary, hire_date FROM EMPLOYEES ORDER BY 2 DESC; What is true about them?（）

A、The two statements produce identical results.  B、The second statement returns a syntax error.  C、There is no need to specify DESC because the results are sorted in descending order by default.  D、The two statements can be made to produce identical results by adding a column alias for the salary column in the second SQL statement.  

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第7题
[] The STUDENT_GRADES table has these columns: The register has requested a report listing the students' grade point averages (GPA), sorted from highest grade point average to lowest within each semester, starting from the earliest date. Which statement accomplishes this?（） The STUDENT_GRADES table has these columns: The register has requested a report listing the students' grade point averages (GPA), sorted from highest grade point average to lowest within each semester, starting from the earliest date. Which statement accomplishes this?（）

A、A. SELECT student_id, semester_end, gpa FROM student_grades ORDER BY semester_end DESC, gpa DESC;  B、B. SELECT student_id, semester_end, gpa FROM student_grades ORDER BY semester_end ASC, gpa ASC;  C、C. SELECT student_id, semester_end, gpa FROM student_grades ORDER BY semester_end, gpa DESC;  D、D. SELECT student_id, semester_end, gpa FROM student_grades ORDER BY gpa DESC, semester_end DESC;  E、E. SELECT student_id, semester_end, gpa FROM student_grades ORDER BY gpa DESC, semester_end ASC;  

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第8题
[单选题] The STUDENT_GRADES table has these columns: STUDENT_ID NUMBER(12) SEMESTER_END DATE GPA NUMBER(4,3) The register has requested a report listing the students' grade point averages (GPA), sorted from highest grade point average to lowest within each semester, starting from the earliest date. Which statement accomplishes this?（）

A、SELECT student_id, semester_end, gpa FROM student_grades ORDER BY semester_end DESC, gpa DESC;  B、SELECT student_id, semester_end, gpa FROM student_grades ORDER BY semester _end, ASC,gpa ASC;  C、SELECT student_id, semester_end, gpa FROM student_grades ORDER BY semester _end, gpa DESC;  D、SELECT student_id, semester_end, gpa FROM student_grades ORDER BY gpa DESC,semester_end DESC;  E、SELECT student_id, semester_end, gpa FROM student_grades  

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第9题
[单选题] HQL语句：String hql ="from Dept as model order by model.deptName，model.createDate desc"；所表达的意思为（）。

A、查询部门，按照deptName的desc排序  B、查询部门，按照createDate的desc排序  C、查询部门，先按照deptName的desc排序，再按照createDate的desc排序  D、查询部门，deptName和createDate的desc排序没有先后之分  

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第10题
[单选题] Evaluate these two SQL statements: What is true about them?（）

A、The two statements produce identical results.  B、The second statement returns a syntax error.  C、There is no need to specify DESC because the results are sorted in descending order by default.  D、The two statements can be made to produce identical results by adding a column alias for the salary column in the second SQL statement.  

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