071考試不僅是OCP11g的考試科目，同時也是OCP 12c的考試科目，所以關心071考題的同學有很多，對此我們專門收集整理了近期071考試的原題，并對這些考題進行講解，希望幫助廣大考生順利通過071考試。
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071考題解析-第64題、choose the best answer:
View the Exhibit and examine the structure of the ORDERS and ORDER_ITEMS tables.
Evaluate the following SQL statement:
SELECT oi.order_id, product_id, order_date
FROM order_items oi JOIN orders o
USING(order_id);
Which statement is true regarding the execution of this SQL statement?
A) The statement would not execute because the table alias prefix is not used in the USING clause.
B) The statement would not execute because the column part of the USING clause cannot have a qualifier in the SELECT list.
C) The statement would not execute because table aliases are not allowed in the JOIN clause.
D) The statement would not execute because all the columns in the SELECT clause are not prefixed with table aliases.
Anser：B
(解析：該題考的是語法，因為 USING 子句的列部分在 SELECT 列表中不能具有限定符，所以該語句不會執行，把前綴 oi 去掉就可以了，但是其它的列可以用表的別名做為前綴：
SELECT order_id, oi.product_id, order_date
FROM order_items oi JOIN orders o
USING(order_id);
)該題之前有過類似的考題。
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