OCP考试题库以前是比较稳定的,但在2018年随着oracle的调整,不断的有新题出现,增加考试的难度,对此,我们专门收集整理了071的考试真题,分享给大家。
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071题库分享-第30题、choose the best answer
View the Exhibit and examine the structure of the SALES and STORES tables.
You want to display the store name and the total quantity sold for each item in the store.
Which SQL statement will give the required output?
A) SELECT str.name, s1.items_id, SUM(s1.quantity)
FROM sales s1 JOIN stores str
ON (s1.store_id = str.store_id)
GROUP BY str.name, s1.items_id, s1.quantity;
B) SELECT str.name, s1.items_id, SUM(s1.quantity)
FROM sales s1 JOIN stores str
ON (s1.store_id = str.store_id)
GROUP BY str.name, s1.items_id;
C) SELECT str.name, s1.items_id,
(SELECT SUM(quantitY)
FROM sales sls
ON sls.store_id = s1.store_id
GROUP BY sls.store_id)
FROM sales s1 JOIN stores str
ON (s1.store_id = str.store_id);
D) SELECT str.name, s1.items_id, SUM(s1.quantity)
FROM sales s1 JOIN stores str ON (s1.store id = str.store_id)
GROUP BY s1.items_id, s1.quantity;
Answer:B
(解析:分组函数的最基本特点,没有出现在分组函数中的列必须要出现在 group by 子句中。)
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