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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美国管理学家（）提出了成就需要理论。
A. 弗雷德里克•赫茨伯格
B. 马斯洛
C. 大卫•麦克莱兰
D. 弗鲁姆
男，35岁。感冒1周后出现双下肢近端无力。查体：双上肢肌力3级，双下肢肌力3级，四肢腱反射消失，手套袜子样痛觉减退，双腓肠肌压痛阳性。其原因最可能是（）
A. 急性脊髓炎
B. 脊髓压迫症
C. 周期性麻痹
D. 急性炎症性脱髓鞘性多发性神经病
E. 急性肌炎
Youre performing tablespace point-in-time recovery on a tablespace called USERS. If an object in that tablespace has a foreign key constraint owned by another object in the INDEX_TBS which statement is true？（）
A. You cannot perform the TSPITR with the constraints enabled.
B. You must perform the TSPITR recovery of both tablespaces for it to be successful.
C. You can perform TSPITR only on the USERS tablespace.
D. RMAN will determine if the INDEX_TBS tablespace must also be duplicated and will duplicate it automatically.
E. The TSPITR will only be successful if the constraint is enabled.
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