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Oracle Introduction to Oracle9i: SQL Sample Questions:

1. Examine the structures of the EMPLOYEES and TAX tables.

You need to find the percentage tax applicable for each employee. Which SQL statement would you use?

A) SELECT employee_id, salary, tax_percent FROM employees e, tax t WHERE e.salary > t.min_salary, tax_percent
B) SELECT employee_id, salary, tax_percent FROM employees e, tax t WHERE MIN(e.salary) = t.min_salary AND MAX(e.salary) = t.max_salary
C) SELECT employee_id, salary, tax_percent FROM employees e, tax t WHERE e.salary BETWEEN t.min_salary AND t.max_salary;
D) You cannot find the information because there is no common column between the two tables.

2. You define a multiple-row subquery in the WHERE clause of an SQL query with a comparison operator "=".
What happens when the main query is executed?

A) You cannot define a multiple-row subquery in the WHERE clause of a SQL query.
B) The main query fails because the multiple-row subquery cannot be used with the comparison operator.
C) The main query executes with all the values returned by the subquery.
D) The main query executes with the first value returned by the subquery.
E) The main query executes with the last value returned by the subquery.

3. You need to create a view EMP_VU. The view should allow the users to manipulate the records of only the employees that are working for departments 10 or 20.
Which SQL statement would you use to create the view EMP_VU?

A) CREATE VIEW emp_vu AS
SELECT *
FROM employees
WHERE department_id IN (10,20)
WITH READ ONLY;
B) CREATE FORCE VIEW emp_vu AS
SELECT *
FROM employees
WHERE department_id IN (10,20);
C) CREATE VIEW emp_vu AS
SELECT *
FROM employees
WHERE department_id IN (10,20)
WITH CHECK OPTION;
D) CREATE VIEW emp_vu AS
SELECT *
FROM employees
WHERE department_id IN (10,20);
E) CREATE FORCE VIEW emp_vu AS
SELECT *
FROM employees
WHERE department_id IN (10,20)
NO UPDATE;

4. The CUSTOMERS table has these columns:

A promotional sale is being advertised to the customers in France. Which WHERE clause identifies customers that are located in France?

A) WHERE lower(country_address) LIKE %france%
B) WHERE lower(country_address) = '%france%'
C) WHERE lower(country_address) = "france"
D) WHERE lower(country_address) IS 'france'
E) WHERE lower(country_address) = 'france'

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

Solutions: