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NO.1 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 also the foreign key in the
ORDER_ITEMS table wherein it is created with the ON DELETE CASCADE option.
Which DELETE statement would execute successfully?
A. DELETE FROM orders WHERE (SELECT order_id FROM order_items);
B. DELETE order_id FROM orders WHERE order_total < 1000;
C. DELETE orders WHERE order_total < 1000;
D. DELETE orders o, order_items i WHERE o.order id = i.order id;
Answer: C

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NO.2 Which two statements are true regarding constraints? (Choose two.)
A. A column with the UNIQUE constraint can contain NULL.
B. All the constraints can be defined at the column level as well as the table level
C. A foreign key cannot contain NULL values.
D. A constraint can be disabled even if the constraint column contains data.
E. A constraint is enforced only for the INSERT operation on a table.
Answer: A,D

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Posted 2016/12/16 8:57:39  |  Category: Oracle  |  Tag: 1z0-808 feedback1z0-071 freshOracle
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