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Oracle Introduction to Oracle9i: SQL Sample Questions:

1. Which constraint can be defined only at the column level?

A) PRIMARY KEY
B) NOT NULL
C) UNIQUE
D) FOREIGN KEY
E) CHECK

2. You added a PHONE_NUMBER column of NUMBER data type to an existing EMPLOYEES table. The EMPLOYEES table already contains records of 100 employees. Now, you want to enter the phone numbers of each of the 100 employees into the table.
Some of the employees may not have a phone number available.
Which data manipulation operation do you perform?

A) UPDATE
B) INSERT
C) MERGE
D) ADD
E) ENTER
F) You cannot enter the phone numbers for the existing employee records.

3. Exhibit

Examine the data in the EMPLOYEES and DEPARTMENTS tables.
You want to retrieve all employees' last names, along with their manager's last names and their department names. Which query would you use?

A) SELECT e.last_name, m.last_name, department_name
FROM employees e
LEFT OUTER JOIN employees m on ( e.manager_id = m.employee_id)
RIGT OUTER JOIN departments d ON (e.department_id = d.department_id);
B) SELECT e.last_name, m.last_name, department_name
FROM employees e
RIGT OUTER JOIN employees m on ( e.manager_id = m.employee_id)
LEFT OUTER JOIN departments d ON (e.department_id = d.department_id);
C) SELECT last_name, manager_id, department_name
FROM employees e
FULL OUTER JOIN departments d ON (e.department_id = d.department_id);
D) SELECT e.last_name, m.last_name, department_name
FROM employees e
LEFT OUTER JOIN employees m on ( e.managaer_id = m.employee_id)
LEFT OUTER JOIN departments d ON (e.department_id = d.department_id);
E) SELECT e.last_name, m.last_name, department_name
FROM employees e
RIGHT OUTER JOIN employees m on ( e.manager_id = m.employee_id)
RIGHT OUTER JOIN departments d ON (e.department_id = d.department_id)
F) SELECT last_name, manager_id, department_name
FROM employees e
JOIN departments d ON (e.department_id = d.department_id) ;

4. What is necessary for your query on an existing view to execute successfully?

A) You need SELECT privileges on the view.
B) You need SELECT privileges only on the underlying tables.
C) The underlying tables must be in the same schema.
D) The underlying tables must have data.

5. Which two statements complete a transaction? (Choose two)

A) DELETE employees;
B) ALTER TABLE employees
SET UNUSED COLUMN sal;
C) DESCRIBE employees;
D) ROLLBACK TO SAVEPOINT C;
E) Select MAX(sal)
FROM employees
WHERE department_id = 20;
F) GRANT SELECT ON employees TO SCOTT;

Solutions: