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ocp-047-96(疑问)

96. View the Exhibit and examine the structure of ORDERS and ORDER_ITEMS 

tables.ORDER_ID is the primary key in the ORDERS table. It is a lso the foreign 

key in the ORDER_ITEMS table where in it is created with the ON  DELETE CASCADE 

option. Which DELETE statement would execute successfully? 

A. DELETE order_id FROM orders WHERE order_total < 1000; 

B. DELETE orders WHERE order_total < 1000; 

C. DELETE FROM orders WHERE (SELECT order_id FROM order_items); 

D.DELETE orders o, order_items I WHERE o.order_id = i.order_id; 

Answer: B