大數據就業(yè)實戰(zhàn)培訓 Oracle就業(yè)實戰(zhàn)培訓
071考試題庫之前是比較穩(wěn)定的，但隨著Oracle的調整，071考試不斷的增加新的考題，增加了考試的難度，所以我們專門收集整理了這些考試，并對這些考題進行解析，希望可以對考生有幫助。
每周五晚8點，我們有免費的OCP解析公開課，地址：https://ke.qq.com/course/326223 OCP題庫交流群：1015267481，驗證ocp
-------------------------------------------------------
071考試-第15題、choose the best answer
View the Exhibit and examine the structure of the ORDER_ITEMS table.
Examine the following SQL statement:
SELECT order_id, product_id, unit_price
FROM order_items
WHERE unit_price =
(SELECT MAX(unit_price)
FROM order items
GROUP BY order_id);
You want to display the PRODUCT_ID of the product that has the highest UNIT_PRICE per ORDER_ID.
What correction should be made in the above SQL statement to achieve this?
A) Replace = with the >ALL operator.
B) Replace = with the >ANY operator.
C) Remove the GROUP BY clause from the subquery and place it in the main query.
D) Replace = with the IN operator.
Answer：D
(解析：題意是希望顯示每個 ORDER_ID 具有最高 UNIT_PRICE 的產品的 PROT_ID 的信息)
