160. View the Exhibit and examine the structure of ORDERS and CUSTOMERS tables.
There is only one customer with the cust_last_name column having value Roberts. 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,'10-mar-2007', '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,'10-mar-2007', 'direct', &&customer_id, 1000);
C. 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,'10-mar-2007', 'direct',(SELECT customer_id
FROM customers
WHERE cust_last_name='Roberts' AND
credit_limit=600), 1000);
D. 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,'10-mar-2007', 'direct', &customer_id, 1000);
Answer: A
答案解析：
只有一个customer的cust_last_name列的值是Roberts。
题意问哪一个INSERT语句能被用于给ORDERS添加一行，customer的cust_last_name为Roberts，并且CREDIT_LIMIT为600，只有A正确
BCD语法错误。
