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Oracle Introduction to Oracle9i: SQL Sample Questions:

1. 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, 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';
D) 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;

2. Examine the structure of the EMP_DEPT_VU view:

Which SQL statement produces an error?

A) SELECT department_id, job_id, AVG(salary)
FROM emp_dept_vu
GROUP BY department_id, job_id;
B) SELECT *
FROM emp_dept_vu;
C) SELECT job_id, SUM(salary)
FROM emp_dept_vu
WHERE department_id IN (10,20)
GROUP BY job_id
HAVING SUM(salary) > 20000;
D) None of the statements produce an error; all are valid.
E) SELECT department_id, SUM(salary)
FROM emp_dept_vu
GROUP BY department_id;

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) You must remove the existing view first, and then run the CREATE VIEW command with a new column list to modify a view.
B) 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;
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) 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;
E) ALTER VIEW emp_dept_vu (ADD manager_id NUMBER);
F) MODIFY VIEW emp_dept_vu (ADD manager_id NUMBER);

4. Which three SELECT statements displays 2000 in the format "$2,000.00"? (Choose three)

A) SELECT TO CHAR (2000, '$N,NNN.NN') FROM dual;
B) SELECT TO CHAR (2000, '$2,000.00') FROM dual;
C) SELECT TO CHAR (2000, '$9,999.00') FROM dual;
D) SELECT TO CHAR (2000,'$#,###.##') FROM dual;
E) SELECT TO CHAR (2000, '$9,999.99') FROM dual;
F) SELECT TO CHAR (2000, '$0,000.00') FROM dual;

5. You are granted the CREATE VIEW privilege. What does this allow you to do?

A) Create a sequence view in any schema.
B) Create a view in your schema.
C) Create a view in any schema.
D) Create a table view.
E) Create a view that is accessible by everyone.
F) Create a view only of it is based on tables that you created.

Solutions: