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View the exhibit and examine the structure of ORDERS and CUSTOMERS tables.
ORDERS
Name Null? Type
ORDER_ID NOT NULL NUMBER(4)
ORDER_DATE NOT NULL DATE
ORDER_MODE VARCHAR2(8)
CUSTOMER_ID NOT NULL NUMBER(6)
ORDER_TOTAL NUMBER(8, 2)
CUSTOMERS
Name Null? Type
CUSTOMER_ID NOT NULL NUMBER(6)
CUST_FIRST_NAME NOT NULL VARCHAR2(20)
CUST_LAST_NAME NOT NULL VARCHAR2(20)
CREDIT_LIMIT NUMBER(9,2)
CUST_ADDRESS VARCHAR2(40)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? Assume there exists only one row with
CUST_LAST_NAME as Roberts and CREDIT_LIMIT as 600.

A.
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’ AND
c.credit_limit=600)
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 orders
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);

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