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Oracle Introduction to Oracle9i: SQL Sample Questions:

1. What does the TRUNCATE statement do?

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

2. 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 WHERE department_id IN (SELECT department_id FROM 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
NATURAL JOIN departments;

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

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

4. You need to write a SQL statement that returns employee name, salary, department ID, and maximum salary earned in the department of the employee for all employees who earn less than the maximum salary in their department.
Which statement accomplishes this task?

A) SELECT emp_name, sal, dept_id, maxsal FROM employees, (SELECT dept_id, MAX(sal) maxsal FROM employees GROUP BY dept_id) WHERE a.sal < maxsal;
B) SELECT a.emp_name, a.sal, b.dept_id, MAX(sal) FROM employees a, departments b WHERE a.dept_id = b.dept_id AND a.sal < MAX(sal) GROUP BY b.dept_id;
C) SELECT a.emp_name, a.sal, a.dept_id, b.maxsal FROM employees a, (SELECT dept_id, MAX(sal) maxsal FROM employees GROUP BY dept_id) b WHERE a.dept_id = b.dept_id AND a.sal < b.maxsal;
D) SELECT a.emp_name, a.sal, a.dept_id, b.maxsal FROM employees a WHERE a.sal < (SELECT MAX(sal) maxsal FROM employees b GROUP BY dept_id);

5. You need to modify the STUDENTS table to add a primary key on the STUDENT_ID column. The table is currently empty.
Which statement accomplishes this task?

A) ALTER TABLE students
ADD CONSTRAINT stud_id_pk PRIMARY KEY student_id;
B) ALTER TABLE students
ADD CONSTRAINT stud_id_pk PRIMARY KEY (student_id);
C) ALTER TABLE students
ADD PRIMARY KEY student_id;
D) ALTER TABLE students
ADD CONSTRAINT PRIMARY KEY (student_id);
E) ALTER TABLE students
MODIFY CONSTRAINT stud_id_pk PRIMARY KEY (student_id);

Solutions: