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Oracle Introduction to Oracle9i: SQL Sample Questions:

1. What does the TRUNCATE statement do?

A) Removes foreign keys from a table
B) Shortens the table to 10 rows
C) Removes all rows from a table
D) Removes the table
E) Removes all columns from a table

2. Which are DML statements? (Choose all that apply)

A) UPDATE...
B) CREAT..
C) DROP...
D) DELETE...
E) COMMIT...
F) MERGE...

3. In which two cases would you use an outer join? (Choose two.)

A) The columns being joined have NULL values.
B) The tables being joined have both matched and unmatched data.
C) The tables being joined have only unmatched data.
D) The tables being joined have NOT NULL columns.
E) Only when the tables have a primary key/foreign key relationship.
F) The tables being joined have only matched data.

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

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

Solutions: