1z0-071 Exam Dumps | Examine this statement: CREATE TABTE orders (sarial_no NUMBER UNIQUE, order_id NUMBER PRIMARY KEY , order

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Question 121/139

Examine this statement:
CREATE TABTE orders
(sarial_no NUMBER UNIQUE,
order_id NUMBER PRIMARY KEY ,
order_date DATE NOT NULL,
status VARCHAR2 (10) CHECK (status IN ('CREDIT', 'CASH')),
product_id NUMBER REFERENCES products (product_id),
order_ total NUMBER);
On which two columns of the table will an index be created automatically?

A. SERIAL_NO

B. ORDER_DATE

C. PRODUCT_ ID

D. ORDER TOTAL

E. ORDER_ ID

F. STATUS

Correct Answer: A,E

An index is created automatically on columns that are defined with a UNIQUE constraint and a PRIMARY KEY constraint.
A). True. Since the serial_no column is defined with a UNIQUE constraint, Oracle will automatically create an index for this column.
E). True. The order_id column is defined with a PRIMARY KEY constraint, and Oracle automatically creates a unique index on the primary key column.

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