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ocp 11g认证考试题:1Z0-051-069题

ocp 11g认证考试题:1Z0-051-069题

来源:优技教育    更新时间:2016/8/3 16:16:31    阅读次数:817

ocp 11g认证考试题:1Z0-051-069题,完整题库请点击这里联系老师咨询了解

69. You need to generate a list of all customer last names with their credit limits from the CUSTOMERS

table. Those customers who do not have a credit limit should appear last in the list.

Which two queries would achieve the required result? (Choose two.)

A. SELECT cust_last_name, cust_credit_limit

FROM customers

ORDER BY cust_credit_limit DESC ;

B. SELECT cust_last_name, cust_credit_limit

FROM customers

ORDER BY cust_credit_limit;

C. SELECT cust_last_name, cust_credit_limit

FROM customers

ORDER BY cust_credit_limit NULLS LAST;

D. SELECT cust_last_name, cust_credit_limit

FROM customers

ORDER BY cust_last_name, cust_credit_limit NULLS LAST;

Answer: BC

答案解析:

对于升序排序,空值显示在最后,对于降序排序,则显示在最前面

who do not have a credit limit should appear last in the list

题目要求空值在最后面

要么升序排列,要么指定nulls last

D先按照cust_last_name排序,在按照 cust_credit_limit空值最后排序,不符合题意。

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