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Oracle Introduction to Oracle9i: SQL Sample Questions:

1. The user Sue issues this SQL statement:
GRANT SELECT ON sue.EMP TO alice WITH GRANT OPTION;
The user Alice issues this SQL statement:
GRANT SELECT ON sue.EMP TO reena WITH GRANT OPTION;
The user Reena issues this SQL statement:
GRANT SELECT ON sue.EMP TO timber;
The user Sue issues this SQL statement:
REVOKE select on sue.EMP FROM alice;
For which users does the revoke command revoke SELECT privileges on the SUE.EMP table?

A) Sue, Alice, Reena, and Timber
B) Alice only
C) Alice and Reena
D) Alice, Reena, and Timber

2. The EMPLOYEE tables have these columns:

You want to display the name and annual salary multiplied by the commission_pct for all employees. For records that have a NULL commission_pct, a zero must be displayed against the calculated column.
Which SQL statement displays the desired results?

A) SELECT last_name, (salary * 12) * NVL(commission_pct, 0) FROM EMPLOYEES;
B) SELECT last_name, (salary * 12) * IFNULL(commission_pct, 0) FROM EMPLOYEES;
C) SELECT last_name, (salary * 12) * NVL2(commission_pct, 0) FROM EMPLOYEES;
D) SELECT last_name, (salary * 12) * commission_pct FROM EMPLOYEES;

3. You are the DBA for an academic database. You need to create a role that allows a group of users to modify existing rows in the STUDENT_GRADES table.
Which set of statements accomplishes this?

A) CREATE NEW ROLE registrar; GRANT ALL ON student_grades TO registrar; GRANT registrar to user1, user2, user3
B) CREATE ROLE registrar; GRANT MODIFY ON student_grades TO registrar; GRANT registrar to user1, user2, user3
C) CREATE ROLE registrar; GRANT UPDATE ON student_grades TO registrar; GRANT registrar to user1, user2, user3;
D) CREATE registrar; GRANT CHANGE ON student_grades TO registrar; GRANT registrar;
E) CREATE ROLE registrar; GRANT UPDATE ON student_grades TO registrar; GRANT ROLE registrar to user1, user2, user3

4. The database administrator of your company created a public synonym called HR for the HUMAN_RESOURCES table of the GENERAL schema, because many users frequently use this table.
As a user of the database, you created a table called HR in your schema. What happens when you execute this query?
SELECT *
FROM HR;

A) You obtain the results retrieved from both the public synonym HR and the HR table that belongs to your schema, as a FULL JOIN.
B) You get an error message because you cannot retrieve from a table that has the same name as a public synonym.
C) You obtain the results retrieved from the HR table that belongs to your schema.
D) You obtain the results retrieved from both the public synonym HR and the HR table that belongs to your schema, as a Cartesian product.
E) You obtain the results retrieved from the public synonym HR created by the database administrator.

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

Solutions: