View the Exhibit and examine the structure of the ORDERS table.
Which UPDATE statement is valid?
A. UPDATE orders SET order_date = ’12-mar-2007′, order_total IS NULL WHERE order_id = 2455;
B. UPDATE orders
SET order_date = ’12-mar-2007′,
AND order_total = TO_NUMBER(NULL)
WHERE order_id = 2455;
C. UPDATE orders
SET order_date = ’12-mar-2007′, order_total = NULL WHERE order_id = 2455;
D. UPDATE orders
SET order_date = TO_DATE(’12-mar-2007′,’dd-mon-yyyy’),
SET order_total = TO_NUMBER (NULL)
WHERE order_id = 2455;
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