【第49题】OCP认证1Z0-071最新考试题库及答案

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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071考题解析-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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