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Oracle Introduction to Oracle9i: SQL Sample Questions:

1. The ORDERS table has these columns:

The ORDERS table tracks the Order number, the order total, and the customer to whom the Order belongs. Which two statements retrieve orders with an inclusive total that ranges between 100.00 and 2000.00 dollars? (Choose two.)

A) SELECT customer_id, order_id, order_total FROM orders WHERE order_total >= 100 and order_total <= 2000;
B) SELECT customer_id, order_id, order_total FROM orders WHERE order_total BETWEEN 100 and 2000;
C) SELECT customer_id, order_id, order_total FROM orders HAVING order_total BETWEEN 100 and 2000;
D) SELECT customer_id, order_id, order_total FROM orders RANGE ON order_total (100 AND 2000) INCLUSIVE;
E) SELECT customer_id, order_id, order_total FROM orders WHERE order_total >= 100 and <= 2000;

2. For which two constraints does the Oracle Server implicitly create a unique index? (Choose two.)

A) PRIMARY KEY
B) UNIQUE
C) FOREIGN KEY
D) CHECK
E) NOT NULL

3. What is true about joining tables through an equijoin?

A) You can join a maximum of two columns through an equijoin.
B) You specify an equijoin condition in the SELECT or FROM clauses of a SELECT statement.
C) You can join a maximum of two tables through an equijoin.
D) You can join n tables (all having single column primary keys) in a SQL statement by specifying a minimum of n-1 join conditions.
E) To join two tables through an equijoin, the columns in the join condition must be primary key and foreign key columns.

4. Evaluate this SQL statement:
SELECT e.emp_name, d.dept_name
FROM employees e
JOIN departments d
USING (department_id)
WHERE d.department_id NOT IN (10,40)
ORDER BY dept_name;
The statement fails when executed. Which change fixes the error?

A) remove the ORDER BY clause
B) remove the table alias prefix from the WHERE clause
C) prefix the column in the ORDER BY clause with the table alias
D) remove the table alias from the SELECT clause
E) prefix the column in the USING clause with the table alias
F) replace the condition
"d.department_id NOT IN (10,40)"
in the WHERE clause with
"d.department_id <> 10 AND d.department_id <> 40"

5. Examine the SQL statements that create ORDERS table:

For which columns would an index be automatically created when you execute the above
SQL statement? (Choose two)

A) ORDER_ID
B) ORD_TOTAL
C) SER_NO
D) PROD_ID
E) STATUS
F) Composite index on ORDER_ID and ORDER_DATE

Solutions: