Home » Oracle » 1z0-051 » Which columns would an index be automatically created when you execute the above SQL statement?
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.)
A. SER_NO
B. ORDER_ID
C. STATUS
D. PROD_ID
E. ORD_TOTAL
F. composite index on ORDER_ID and ORDER_DATE
Correct Answer: AF
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
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