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Examine the SQL statement that creates ORDERS table: CREATE TABLE orders (SER_NO NUMBER UNIQUE, ORDER_ID NUMBER, ORDER_DATE DATE NOT NULL, STATUS VARCHAR2(10) CHECK (status IN ('CREDIT', 'CASH')), PROD_ID NUMBER REFERENCES PRODUCTS(PRODUCT_ID), ORD_TOTAL NUMBER, PRIMARY KEY (order_id, order_date)); For which columns would an index be automatically created when you execute the above SQL statement? (Choose two.)
Correct Answer: A,F
Explanation/Reference: Explanation: Index exist for UNIQUE and PRIMARY KEY constraints Incorrect answer: BORDER_ID is neither UNIQUE nor PRIMARY KEY CSTATUS is neither UNIQUE nor PRIMARY KEY DPROD_ID is neither UNIQUE nor PRIMARY KEY EORD_TOTAL is neither UNIQUE nor PRIMARY KEY Refer: Introduction to Oracle9i: SQL, Oracle University Study Guide, 10-15