OCP认证是Oracle非常重要的一个认证，对于11g版本来说，考试科目为071、052、053，对于12c版本来说，考试科目为071、062、063，可见071是个很重要的考试，这里我们收集了近期071考试的原题，分享给大家。
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071考题整理-第54题、choose the best answer:
View the Exhibit and examine the structure of the ORDER_ITEMS and ORDERS tables.
You are asked to retrieve the ORDER_ID, PRODUCT_ID, and total price (UNIT_PRICE multiplied by QUANTITY), where the total price is greater than 50,000.
You executed the following SQL statement:
SELECT order_id, product_id, unit_price*quantity "Total Price"
FROM order_items
WHERE unit_price*quantity > 50000
NATURAL JOIN orders;
Which statement is true regarding the execution of the statement?
A) The statement would not execute because the WHERE clause is before the NATURAL JOIN clause.
B) The statement would not execute because the USING keyword is missing in the NATURAL JOIN clause.
C) The statement would execute and provide the desired result.
D) The statement would not execute because the ON keyword is missing in the NATURAL JOIN clause.
Answer：A
(解析：注意语法，where 子句应该出现在各种连接的语句后面，比如 right outer join 等等。)
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