ocp-047-151

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151. View the Exhibit and examine the structure of ORDERS and CUSTOMERS tables. Which INSERT statement should be used to add a row into the ORDERS table for the customer whose CUST_LAST_NAME is Roberts and CREDIT_LIMIT is 600?
A. INSERT INTO orders VALUES (1,'10mar2007', 'direct', (SELECT customer_id FROM customers WHERE cust_last_name='Roberts' AND credit_limit=600), 1000);
B. INSERT INTO orders (order_id,order_date,order_mode, (SELECT customer_id FROM customers WHERE cust_last_name='Roberts' AND credit_limit=600),order_total) VALUES(1,'10mar2007', 'direct', &&customer_id, 1000);
C. INSERT INTO orders (order_id,order_date,order_mode, (SELECT customer_id FROM customers WHERE cust_last_name='Roberts' AND credit_limit=600),order_total) VALUES(1,'10mar2007', 'direct', &customer_id, 1000);
D. INSERT INTO(SELECT o.order_id, o.order_date,o.order_mode,c.customer_id, o.order_total FROM orders o, customers c WHERE o.customer_id = c.customer_id AND c.cust_last_name='Roberts' ANDc.credit_limit=600 ) VALUES (1,'10mar2007', 'direct',(SELECT customer_id FROM customers WHERE cust_last_name='Roberts' AND credit_limit=600), 1000);

答案: A
分析: 本题考点视图/view
题目要求向ORDERS表插入记录，CUST_LAST_NAME是Roberts并且CREDIT_LIMIT=600的顾客的customer_id
B. insert into表名(列名...)列名列表不能有select语句。
C. insert into表名(列名...)列名列表不能有select语句。
D. 相当于对视图进行操作，Oracle不允许对包含GROUP BY 子句的复杂视图进行dml操作。