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Oracle Introduction to Oracle9i: SQL Sample Questions:

1. Examine the data from the EMP table. Evaluate this SQL statement:
SELECT * FROM emp WHERE commission = (SELECT commission FROM emp
WHERE emp_id=3);
What is the result when the query is executed?

A) The query fails because both the inner and outer queries are retrieving data from the same table.
B) Exhibit B
C) Exhibit A
D) The query fails because the outer query is retrieving more than one column
E) The query returns no rows

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

3. You are granted the CREATE VIEW privilege. What does this allow you to do?

A) Create a view that is accessible by everyone.
B) Create a view in your schema.
C) Create a sequence view in any schema.
D) Create a table view.
E) Create a view only of it is based on tables that you created.
F) Create a view in any schema.

4. Examine the structure of the EMPLOYEES table:
EMPLOYEE_ID NUMBER NOT NULL, Primary Key EMP_NAME VARCHAR2(30) JOB_ID NUMBER\ SAL NUMBER MGR_ID NUMBER References EMPLOYEE_ID column DEPARTMENT_ID NUMBER Foreign key to DEPARTMENT_ID column of the
DEPARTMENTS table
You created a sequence called EMP_ID_SEQ in order to populate sequential values for the EMPLOYEE_ID column of the EMPLOYEES table.
Which two statements regarding the EMP_ID_SEQ sequence are true? (Choose two.)

A) The EMP_ID_SEQ sequence is invalidated when you modify the EMPLOYEE_ID column.
B) The EMP_ID_SEQ sequence is dropped automatically when you drop the EMPLOYEE_ID column.
C) Any other column of NUMBER data type in your schema can use the EMP_ID_SEQ sequence.
D) The EMP_ID_SEQ sequence is not affected by modifications to the EMPLOYEES table.
E) You cannot use the EMP_ID_SEQ sequence to populate the JOB_ID column.
F) The EMP_ID_SEQ sequence is dropped automatically when you drop the EMPLOYEES table.

5. Which object privileges can be granted on a view?

A) DELETE, INSERT,SELECT
B) none
C) DELETE, INSERT, SELECT, UPDATE
D) ALTER, DELETE, INSERT, SELECT

Solutions: