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【第10题】OCP认证1Z0-071最新考试题库及答案

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071考试不仅是OCP11g的考试科目，同时也是OCP 12c的考试科目，所以关心071考题的同学有很多，对此我们专门收集整理了近期071考试的原题，并对这些考题进行讲解，希望帮助广大考生顺利通过071考试。

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10.choose the best answer

Evaluate the following SQL statement:

SQL> SELECT promo_id, promo_category

FROM promotions

WHERE promo_category = 'Internet' ORDER BY 2 DESC

UNION

SELECT promo_id, promo_category

FROM promotions

WHERE promo_category = 'TV'

UNION

SELECT promo_id, promo_category

FROM promotions

WHERE promo_category ='Radio';

Which statement is true regarding the outcome of the above query?

A) It produces an error because the ORDER BY clause should appear only at the end of a compound query-that is, with the last SELECT statement.

B) It executes successfully and displays rows in the descending order of PROMO_CATEGORY.

C) It produces an error because positional notation cannot be used in the ORDER BY clause with SET operators.

D) It executes successfully but ignores the ORDER BY clause because it is not located at the end of the compound statement.

Answer：A

(执行时 order by 子句只能出现最后的 select 语句，否则出现“ORA-00933: SQL 命令未正确结束”错误)

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