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Oracle Introduction to Oracle9i: SQL Sample Questions:

1. Which view should a user query to display the columns associated with the constraints on a table owned by the user?

A) ALL_CONSTRAINTS
B) USER_CONSTRAINTS
C) USER_CONS_COLUMNS
D) USER_OBJECTS
E) USER_COLUMNS

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

3. In a SELECT statement that includes a WHERE clause, where is the GROUP BY clause placed in the SELECT statement?

A) After the WHERE clause
B) Before the WHERE clause
C) Immediately after the SELECT clause
D) After the ORDER BY clause
E) Before the FROM clause

4. Examine the statement:
Create synonym emp for hr.employees;
What happens when you issue the statement?

A) You create an alternative name for the employees table in the HR schema in your own schema.
B) You create a table called employees in the HR schema based on you EMP table.
C) An error is generated.
D) You will have two identical tables in the HR schema with different names.

5. Examine the description of the STUDENTS table:

Which two aggregate functions are valid on the START_DATE column? (Choose two)

A) COUNT (start_date)
B) SUM (start_date)
C) AVG (start_date)
D) MIN (start_date)
E) AVG (start_date, end_date)
F) MAXIMUM (start_date)

Solutions: