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Oracle Introduction to Oracle9i: SQL Sample Questions:

1. In which two cases would you use an outer join? (Choose two.)

A) Only when the tables have a primary key/foreign key relationship.
B) The columns being joined have NULL values.
C) The tables being joined have only matched data.
D) The tables being joined have both matched and unmatched data.
E) The tables being joined have only unmatched data.
F) The tables being joined have NOT NULL columns.

2. When should you create a role? (Choose two)

A) To simplify the process of creating new users using the CREATE USER xxx IDENTIFIED by yyy statement.
B) To grant a group of related privileges to a user.
C) To simplify the process of granting and revoking privileges.
D) When the number of people using the database is very high.
E) To simplify profile maintenance for a user who is constantly traveling.

3. Which SQL statement defines the FOREIGN KEY constraint on the DEPTNO column of the EMP table?

A) CREATE TABLE EMP
(empno NUMBER(4),
ename VARCHAR2(35),
deptno NUMBER(7,2)
CONSTRAINT emp_deptno_fk REFERENCES dept (deptno));
B) CREATE TABLE EMP
(empno NUMBER(4)
ename VARCHAR2(35),
deptno NUMBER(7,2) NOT NULL,
CONSTRAINT emp_deptno_fk REFERENCES dept (deptno)
FOREIGN KEY (deptno));
C) CREATE TABLE EMP (empno NUMBER(4),
ename VARCHAR2(35),
deptno NUMBER(7,2) FOREIGN KEY
CONSTRAINT emp deptno fk REFERENCES dept (deptno));
D) CREATE TABLE EMP
(empno NUMBER(4),
ename VARCHAR2(35),
deptno NUMBER(7,2) NOT NULL
CONSTRAINT emp_deptno_fk FOREIGN KEY deptno
REFERENCES dept deptno);

4. Exhibit:

Examine the data in the EMPLOYEES table.
Examine the subquery:
SELECT last_name FROM employees WHERE salary IN (SELECT MAX(salary) FROM employees GROUP BY department_id);
Which statement is true?

A) The SELECT statement does not work because the column specified in the GROUP BY clause is not in the SELECT list.
B) The SELECT statement does not work because the GROUP BY clause should be in the
main query and not in the subquery.
C) The SELECT statement is syntactically accurate.
D) The SELECT statement does not work because there is no HAVING clause.

5. Which is an iSQL*Plus command?

A) UPDATE
B) INSERT
C) SELECT
D) DELETE
E) DESCRIBE
F) RENAME

Solutions: