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Oracle Introduction to Oracle9i: SQL Sample Questions:

1. Which two statements about creating constraints are true? (Choose two)

A) All constraints must be defines at the column level.
B) Constraints can be created at the same time the table is created.
C) Information about constraints is found in the VIEW_CONSTRAINTS dictionary view.
D) Constraint names must start with SYS_C.
E) Constraints can be created after the table is created.

2. Evaluate these two SQL statements:
SELECT last_name, salary , hire_date
FROM EMPLOYEES
ORDER BY salary DESC;
SELECT last_name, salary, hire_date
FROM EMPLOYEES
ORDER BY 2 DESC;
What is true about them?

A) The two statements produce identical results.
B) The two statements can be made to produce identical results by adding a column alias for the salary column in the second SQL statement.
C) The second statement returns a syntax error.
D) There is no need to specify DESC because the results are sorted in descending order by default.

3. The DBA issues this SQL command:
CREATE USER scott
IDENTIFIED by tiger;
What privileges does the user Scott have at this point?

A) No privileges.
B) Only the SELECT privilege.
C) Only the CONNECT privilege.
D) All the privileges of a default user.

4. Which statement explicitly names a constraint?

A) ALTER TABLE student_grades ADD NAME student_id_fk FOREIGN KEY (student_id) REFERENCES students(student_id);
B) ALTER TABLE student_grades ADD NAMED CONSTRAINT student_id_fk FOREIGN KEY (student_id) REFERENCES students(student_id);
C) ALTER TABLE student_grades ADD CONSTRAINT student_id_fk FOREIGN KEY (student_id) REFERENCES students(student_id);
D) ALTER TABLE student_grades ADD FOREIGN KEY (student_id) REFERENCES students(student_id);
E) ALTER TABLE student_grades ADD CONSTRAINT NAME = student_id_fk FOREIGN KEY (student_id) REFERENCES students(student_id);

5. The EMPLOYEES table contains these columns:

You need to write a query that will produce these results:
1.Display the salary multiplied by the commission_pct.
2.Exclude employees with a zero commission_pct.
3.Display a zero for employees with a null commission value.
Evaluate the SQL statement:
SELECT LAST_NAME, SALARY*COMMISSION_PCT
FROM EMPLOYEES
WHERE COMMISSION_PCT IS NOT NULL;
What does the statement provide?

A) Two of the desired results
B) An error statement
C) All of the desired results
D) One of the desired results

Solutions: