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Oracle Introduction to Oracle9i: SQL Sample Questions:

1. 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
GROUP BY dept_id, job_cat;
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;
D) SELECT dept_id, job_cat, MAX(salary)
FROM employees;
E) SELECT dept_id, job_cat, MAX(salary)
FROM employees
WHERE salary > MAX(salary);

2. Examine the structure if the EMPLOYEES table:

You need to create a view called EMP_VU that allows the user to insert rows through the view. Which SQL statement, when used to create the EMP_VU view, allows the user to insert rows?

A) CREATE VIEW emp_Vu AS
SELECT employee_id, emp_name, job_id,
DISTINCT department_id
FROM employees;
B) CREATE VIEW emp_Vu AS
SELECT department_id, SUM(sal) TOTALSAL
FROM employees
WHERE mgr_id IN (102, 120)
GROUP BY department_id;
C) CREATE VIEW emp_Vu AS
SELECT employee_id, emp_name,
department_id
FROM employees
WHERE mgr_id IN (102, 120);
D) CREATE VIEW emp_Vu AS
SELECT employee_id, emp_name, job_id
department_id
FROM employees
WHERE mgr_id IN (102, 120);

3. You created a view called EMP_DEPT_VU that contains three columns from the EMPLOYEES and DEPARTMENTS tables:
EMPLOYEE_ID, EMPLOYEE_NAME AND DEPARTMENT_NAME.
The DEPARTMENT_ID column of the EMPLOYEES table is the foreign key to the primary key DEPARTMENT_ID column of the DEPARTMENTS table.
You want to modify the view by adding a fourth column, MANAGER_ID of NUMBER data type from the EMPLOYEES tables.
How can you accomplish this task?

A) ALTER VIEW emp_dept_vu AS SELECT employee_id, employee_name, department_name, manager_id FROM employee e, departments d WHERE e.department_id = d.department_id;
B) MODIFY VIEW emp_dept_vu (ADD manager_id NUMBER);
C) CREATE OR REPLACE VIEW emp_dept_vu AS SELECT employee_id, employee_name, department_name, manager_id FROM employees e, departments d WHERE e.department_id = d.department_id;
D) MODIFY VIEW emp_dept_vu AS SELECT employee_id, employee_name, department_name, manager_id FROM employees e, departments d WHERE e.department_id = d.department_id;
E) ALTER VIEW emp_dept_vu (ADD manager_id NUMBER);
F) You must remove the existing view first, and then run the CREATE VIEW command with a new column list to modify a view.

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 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;
B) 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);
C) 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;
D) 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;

5. Examine the structure of the STUDENTS table:

You need to create a report of the 10 students who achieved the highest ranking in the course INT SQL and who completed the course in the year 1999.
Which SQL statement accomplishes this task?

A) SELECT student_ id, marks, ROWNUM "Rank"
FROM students
WHERE ROWNUM <= 10
AND finish_date BETWEEN '01-JAN-99' AND '31-DEC-99'
AND course_id = 'INT_SQL'
ORDER BY marks DESC;
B) SELECT student_id, marks, ROWNUM "Rank"
FROM (SELECT student_id, marks
FROM students
WHERE ROWNUM <= 10
AND finish_date BETWEEN '01-JAN-99' AND
'31-DEC-99'
AND course_id = 'INT_SQL'
ORDER BY marks DESC);
C) SELECT student_id, marks, ROWID "Rank"
FROM students
WHERE ROWID <= 10
AND finish_date BETWEEN '01-JAN-99' AND '31-DEC-99'
AND course_id = 'INT_SQL'
ORDER BY marks;
D) SELECT student_id, marks, ROWNUM "Rank"
FROM (SELECT student_id, marks
FROM students
ORDER BY marks DESC)
WHERE ROWNUM <= 10
AND finish_date BETWEEN '01-JAN-99' AND '31-DEC-99'
AND course_id = 'INT_SQL';

Solutions: