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Oracle Introduction to Oracle9i: SQL Sample Questions:

1. You need to produce a report for mailing labels for all customers. The mailing label must have only the customer name and address. The CUSTOMERS table has these columns:

Which SELECT statement accomplishes this task?

A) SELECT id, name, address, phone FROM customers;
B) SELECT cust_id, cust_name, cust_address, cust_phone FROM customers;
C) SELECT cust_name, cust_address FROM customers;
D) SELECT name, address FROM customers;
E) SELECT* FROM customers;

2. Examine the description of the CUSTOMERS table:

The CUSTOMER_ID column is the primary key for the table.
Which statement returns the city address and the number of customers in the cities Los Angeles or San Francisco?

A) SELECT city_address, COUNT(customer_id)
FROM customers
WHERE city_address IN ( 'Los Angeles', 'San Fransisco')
GROUP BY city_address, customer_id;
B) SELECT city_address, COUNT(*)
FROM customers
WHERE city_address IN ( 'Los Angeles', 'San Fransisco');
C) SELECT city_address, COUNT (customer_id)
FROM customers
GROUP BY city_address IN ( 'Los Angeles', 'San Fransisco');
D) SELECT city_address, COUNT (*)
FROM customers
WHERE city address IN ( 'Los Angeles', 'San Fransisco')
GROUP BY city_address;

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

4. In which scenario would TOP N analysis be the best solution?

A) You want to identify the most senior employee in the company.
B) You want to rank the top three sales representatives who have sold the maximum number of products.
C) You want to find the manager supervising the largest number of employees.
D) You want to identify the person who makes the highest salary for all employees.

5. Which four are attributes of single row functions? (Choose four.)

A) cannot be nested
B) accept arguments which can be a column or an expression
C) manipulate data items
D) return one result per row
E) act on each row returned
F) accept only one argument and return only one value

Solutions: