OCP 11g认证题库详解：1Z0-051-069题
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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
试题解析：
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。
