ocp 11gÈÏÖ¤¿¼ÊÔ051Ìâ¿â½âÎö£ºµÚ40Ì⣬ÍêÕûÌâ¿âÇëµã»÷ÕâÀïÁªÏµÀÏʦ×ÉѯÁ˽â

40. View the Exhibit to examine the description for the SALES and PRODUCTS tables.

You want to create a SALE_PROD view by executing the following SQL statement:

CREATE VIEW sale_prod

AS SELECT p.prod_id, cust_id, SUM(quantity_sold) "Quantity" , SUM(prod_list_price) "Price"

FROM products p, sales s

WHERE p.prod_id=s.prod_id

GROUP BY p.prod_id, cust_id;

Which statement is true regarding the execution of the above statement?

A. The view will be created and you can perform DML operations on the view.

B. The view will be created but no DML operations will be allowed on the view.

C. The view will not be created because the join statements are not allowed for creating a view.

D. The view will not be created because the GROUP BY clause is not allowed for creating a view.

Answer: B

´ð°¸½âÎö£º

A´íÎ󣬴ËÊÓͼΪ¸´ÔÓÊÓͼ£¬´øÓÐgroup by×Ӿ䣬²»ÄܶÔÊÓͼ½øÐÐDML²Ù×÷£¬

BÕýÈ·£¬¿ÉÒÔ´´½¨³É¹¦£¬µ«²»ÄܽøÐÐDML²Ù×÷¡£

C´íÎ󣬿ÉÒÔͨ¹ýjoinÀ´Á¬½ÓÁ½ÕÅ±í´´½¨ÊÓͼ¡£

D´íÎ󣬿ÉÒÔͨ¹ýgroup by ×Ó¾äÀ´´´½¨ÊÓͼ¡£