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Oracle Introduction to Oracle9i: SQL Sample Questions:

1. A subquery can be used to _________.

A) Create groups of data
B) Retrieve data based on an unknown condition
C) Sort data in a specific order
D) Convert data to a different format

2. Examine the data of the EMPLOYEES table.
EMPLOYEES (EMPLOYEE_ID is the primary key. MGR_ID is the ID of managers and refers to the EMPLOYEE_ID)

Which statement lists the ID, name, and salary of the employee, and the ID and name of the employee's manager, for all the employees who have a manager and earn more than 4000?

A) employee_id "Mgr_id", m.emp_name "Manager"
FROM employees e, employees m
WHERE e.mgr_id = m.mgr_id
AND e.salary > 4000;
B) SELECT e.employee_id "Emp_id", e.emp_name "Employee",
C) SELECT employee_id "Emp_id", emp_name "Employee",
salary,
employee_id "Mgr_id", emp_name "Manager"
FROM employees
WHERE salary > 4000;
D) salary,
E) employee_id "Mgr_id", m.emp_name "Manager"
FROM employees e, employees m
WHERE e.mgr_id = m.employee_id
AND e.salary > 4000;
F) salary,
G) mgr_id "Mgr_id", m.emp_name "Manager"
FROM employees e, employees m
WHERE e.employee_id = m.employee_id
AND e.salary > 4000;
H) salary,
I) SELECT e.employee_id "Emp_id", e.emp_name "Employee",
J) SELECT e.employee_id "Emp_id", e.emp_name "Employee",
K) SELECT e.employee_id "Emp_id", e.emp_name "Employee",
L) mgr_id "Mgr_id", m.emp_name "manager"
FROM employees e, employees m
WHERE e.mgr_id = m.employee_id
AND e.salary > 4000;
M) salary,

3. The user Alice wants to grant all users query privileges on her DEPT table. Which SQL statement accomplishes this?

A) GRANT select ON dept TO ALL;
B) GRANT select ON dept TO ALL_USERS;
C) GRANT QUERY ON dept TO ALL_USERS
D) GRANT select ON dept TO PUBLIC;

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

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

5. Evaluate this SQL statement:
SELECT e.employee_id, (.15* e.salary) + (.5 * e.commission_pct)
+ (s.sales amount * (.35 * e.bonus)) AS CALC_VALUE FROM employees e, sales s WHERE e.employee_id = s.emp_id;
What will happen if you remove all the parentheses from the calculation?

A) An error will be reported.
B) The value displayed in the CALC_VALUE column will be lower.
C) There will be no difference in the value displayed in the CALC_VALUE column.
D) The value displayed in the CALC_VALUE column will be higher.

Solutions: