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【第51题】OCP认证1Z0-071最新考试题库及答案

来源：优技培训时间：

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51题、choose the best answer:

Evaluate the following SQL statement:

SQL> SELECT cust_id, cust_last_name

FROM customers

WHERE cust_credit_limit IN

(select cust_credit_limit

FROM customers

WHERE cust_city ='Singapore');

Which statement is true regarding the above query if one of the values generated by the subquery is NULL?

A) It ignores the NULL value and generates output for the other values produced by the subquery.

B) It produces an error.

C) It generates output for NULL as well as the other values produced by the subquery.

D) It executes but returns no rows.

Answer：A

(解析，子查询中如果有出现某行值为 null，则忽略该行，其它的正常处理，原来 051 的考题。

类似的语句：

select ename from emp where empno in (select mgr from emp);

ENAME

----------

FORD

BLAKE

KING

JONES

CLARK

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