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【071考试】最新OCP认证071考试题库整理-第10题

【071考试】最新OCP认证071考试题库整理-第10题

来源:CUUG培训-优技培训    更新时间:2019/5/20 13:33:34    阅读次数:

071考试题库之前是比较稳定的,但随着Oracle的调整,071考试不断的增加新的考题,增加了考试的难度,所以我们专门收集整理了这些考试,并对这些考题进行解析,希望可以对考生有帮助。

每周五晚8点,我们有免费的OCP解析公开课,地址:https://ke.qq.com/course/326223  OCP题库交流群:1015267481,验证ocp

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071考试-第10题、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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