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Oracle Introduction to Oracle9i: SQL Sample Questions:

1. What is true about sequences?

A) The start value of the sequence is always 1.
B) The minimum value of an ascending sequence defaults to 1.
C) The maximum value of descending sequence defaults to 1.
D) A sequence always increments by 1.

2. Examine the data in the EMPLOYEES and DEPARTMENTS tables.

You want to retrieve all employees, whether or not they have matching departments in the departments table. Which query would you use?

A) SELECT last_name, department_name FROM employees , departments(+);
B) SELECT last_name, department_name FROM employees e LEFT OUTER JOIN departments d ON (e.department_id = d.department_id);
C) SELECT last_name, department_name FROM employees e RIGHT OUTER JOIN departments d ON (e.department_id = d.department_id);
D) SELECT last_name, department_name FROM employees JOIN departments (+);
E) SELECT last_name, department_name FROM employees(+) , departments ON (e.department_id = d.department_id);
F) SELECT last_name, department_name FROM employees(+) e JOIN departments d ON (e.department_id = d.department_id);

3. Which four statements correctly describe functions that are available in SQL? (Choose four)

A) NULLIF compares twp expressions and returns null if they are equal, or the first expression if they are not equal.
B) NVL compares two expressions and returns null if they are equal, or the first expression of they are not equal.
C) TRIM trims the heading of trailing characters (or both) from a character string.
D) DECODE translates an expression after comparing it to each search value.
E) TRUNCATE rounds the column, expression, or value to n decimal places.
F) INSTR returns the numeric position of a named character.
G) NVL2 returns the first non-null expression in the expression list.

4. Examine the description of the EMPLOYEES table:

Which statement shows the maximum salary paid in each job category of each department?

A) SELECT dept_id, job_cat, MAX(salary)
FROM employees;
B) SELECT dept_id, job_cat, MAX(salary)
FROM employees
GROUP BY dept_id, job_cat, salary;
C) SELECT dept_id, job_cat, MAX(salary)
FROM employees
GROUP BY dept_id, job_cat;
D) SELECT dept_id, job_cat, MAX(salary)
FROM employees
WHERE salary > MAX(salary);
E) SELECT dept_id, job_cat, MAX(salary)
FROM employees
GROUP BY dept_id;

5. Examine the structure of the EMPLOYEES and DEPARTMENTS tables:

Evaluate this SQL statement:
SELECT employee_id, e.department_id, department_name,
Salary
FROM employees e, departments d
WHERE e.department_id = d.department_id;
Which SQL statement is equivalent to the above SQL statement?

A) SELECT employee_id, d.department_id, department_name,
Salary
FROM employees e
JOIN departments d
ON e.department_id = d.department_id;
B) SELECT employee_id, department_id, department_name,
Salary
FROM employees
NATURAL JOIN departments;
C) SELECT employee_id, department_id, department_name,
Salary
FROM employees
JOIN departments
USING (e.department_id, d.department_id);
D) SELECT employee_id, department_id, department_name, Salary FROM employees WHERE department_id IN (SELECT department_id FROM departments);

Solutions: