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【071考试】最新OCP认证071考试题库整理-第49题

【071考试】最新OCP认证071考试题库整理-第49题

来源:CUUG培训-优技培训    更新时间:2019/6/3 14:12:31    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49题、choose the best answer

Examine the structure of the SHIPMENTS table:

You want to generate a report that displays the PO_ID and the penalty amount to be paid(罚款数额) if the SHIPMENT_DATE is later than one month from the PO_DATE. The penalty is $20 per day.

Evaluate the following two queries:

SQL> SELECT po_id, CASE

WHEN MONTHS_BETWEEN (shipment_date,po_date)>1 THEN

TO_CHAR((shipment_date - po_date)*20) ELSE 'No Penalty' END PENALTY

FROM shipments;

SQL>SELECT po_id, DECODE

(MONTHS_BETWEEN(po_date,shipment_date)>1,

TO_CHAR((shipment_date - po_date) * 20, 'NO Penalty') PENALTY

FROM shipments;

Which statement is true regarding the above commands?

A) Only the second query executes successfully but gives a wrong result.

B) Only the second query executes successfully and gives the correct result.

C) Only the first query executes successfully but gives a wrong result.

D) Both execute successfully and give correct results.

E) Only the first query executes successfully and gives the correct result.

Answer:E

(解析:decode 函数的语法是,decode(条件,值 1,返回值 1,值 2,返回值 2,...值 n,返回值 n,缺省值),

所以不能有>1 的条件判断。原来 051 的题。

该语句可以改写为下面的语句:

SELECT empno,hiredate,

CASE

WHEN MONTHS_BETWEEN (sysdate,hiredate)>1

THEN TO_CHAR((sysdate - hiredate )*20)

ELSE 'No Penalty'

END PENALTY

FROM emp;)

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