【第37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37题、choose the best answer

The PRODUCTS table has the following structure:

Evaluate the following two SQL statements:

SQL>SELECT prod_id, NVL2(prod_expiry_date, prod_expiry_date + 15,'')

FROM products;

SQL>SELECT prod_id, NVL(prod_expiry_date, prod_expiry_date + 15)

FROM products;

Which statement is true regarding the outcome?

A) Both the statements execute and give different results.

B) Both the statements execute and give the same result.

C) Only the second SQL statement executes successfully.

D) Only the first SQL statement executes successfully.

Answer：A

(解析：NVL2 的意思是如果第一个表达式不为空，则返回第二表达式的值，否则返回第三表达式

SQL> select sal,comm,nvl2(comm,comm+10,0) from emp;

SAL COMM NVL2(COMM,COMM+10,0)

---------- ---------- --------------------

800 0

1600 300 310

1250 500 510

2975 0

)

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