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Oracle Introduction to Oracle9i: SQL Sample Questions:

1. Which two statements are true regarding the ORDER BY clause? (Choose two)

A) The sort is in ascending by order by default.
B) The sort is in descending order by default.
C) The ORDER BY clause is executed on the client side.
D) The ORDER BY clause comes last in the SELECT statement.
E) The ORDER BY clause must precede the WHERE clause.
F) The ORDER BY clause is executed first in the query execution.

2. The CUSTOMERS table has these columns:

Which statement finds the rows in the CUSTOMERS table that do not have a postal code?

A) SELECT customer_id, customer_name FROM customers WHERE postal_code = '________';
B) SELECT customer_id, customer_name FROM customers WHERE postal code IS NVL;
C) SELECT customer_id, customer_name FROM customers WHERE postal_code = NULL;
D) SELECT customer_id, customer_name FROM customers WHERE postal_code CONTAINS NULL;
E) SELECT customer_id, customer_name FROM customers WHERE postal_code IS NULL;

3. Evaluate the SQL statement:
1 SELECT a.emp_name, a.sal, a.dept_id, b.maxsal 2 FROM employees a,
3 (SELECT dept_id, MAX(sal) maxsal
4.FROM employees
5.GROUP BY dept_id) b
6.WHERE a.dept_id = b.dept_id
7.AND a.sal < b.maxsal;
What is the result of the statement?

A) The statement returns the employee name, salary, department ID, and maximum salary earned in the department of the employee for all departments that pay less salary then the maximum salary paid in the company.
B) The statement produces an error at line 3.
C) The statement returns the employee name, salary, department ID, and maximum salary earned in the department of the employee for all employees who earn less than the maximum salary in their department.
D) The statement produces an error at line 6.
E) The statement produces an error at line 1.

4. Which three are DATETIME data types that can be used when specifying column definitions? (Choose three.)

A) TIMESTAMP WITH DATABASE TIMEZONE
B) INTERVAL MONTH TO DAY
C) INTERVAL YEAR TO MONTH
D) TIMESTAMP
E) INTERVAL DAY TO SECOND

5. Which describes the default behavior when you create a table?

A) Tables are created in the public schema.
B) The table is accessible to all users.
C) You must specify the schema when the table is created.
D) Tables are created in the DBA schema.
E) Tables are created in your schema.

Solutions: