21: Which term best defines a database system in which data records are stored with no structured relationships between the records?
A.Flat-file database
B.Relational database
C.Distributed database
D.Object-oriented database
Correct Answers: A

22: Which area of database security involves maintaining access to enterprise data?
A.Integrity
B.Privacy
C.Availability
D.Confidentiality
Correct Answers: C

23: Which mechanism provides database users with controlled access to the database through the use of virtual tables?
A.View
B.Data dictionary
C.Database control language
D.Database management system
Correct Answers: A

24: Which database security technique prevents invalid data from being entered into the database?
A.File locking
B.User authorization
C.Parity checks
D.Integrity controls

Correct Answers: D
25: Consider the entity-relationship (ER) diagram shown in the exhibit. What do the characters at the ends of the connecting line indicate?

A.Degree of a relation
B.Cardinality of a relation
C.Primary key of a relation
D.Determinant of a relation
Correct Answers: B

26: Consider the table for an employee database shown in the exhibit. What is the cardinality of the table?

A.5
B.20
C.4
D.25
Correct Answers: C

27: Which type of relational integrity is violated if a primary key in a database has a null value?
A.Entity integrity
B.Domain integrity
C.Domain constraints
D.Referential integrity
Correct Answers: A

28: The exhibit shows a table called Housing Relation. This table relates a unique student identification number with a dormitory building and a room fee for that building. The key for the Housing Relation is Student_ID. If each building charges only one fee and a student can live in only one building, then this table is in which normal form?

A.1NF
B.1NF and 2NF
C.1NF, 2NF, and 3NF
D.1NF, 2NF, 3NF, and BCNF
Correct Answers: B

29: Consider the Registration relation shown in the exhibit. Which of the following SQL statements would return the Registration2 relation from the Registration relation?

A.SELECT Course_Code
FROM Registration;
B.SELECT *
FROM Registration
WHERE Registration_ID = 1003
AND Registration_ID = 1005;
C.SELECT *
FROM Registration
WHERE Course_Code = ‘A4343’;
D.SELECT Registration_ID, Student_ID, First_Name, Last_Name
FROM Registration
WHERE Course_Code = ‘A4343’;
Correct Answers: C

30: Consider the relation shown in the exhibit. Which of the following SQL statements would properly add information for a new employee?

A.INSERT INTO Employee
VALUES(0005, Tim, Bogart, 03-15-77);
B.INSERT INTO Employee(Emp_ID, First_Name, Last_Name, Birth_Date)
VALUES(0004, Tim, Bogart, 03-15-77);
C.INSERT INTO Employee(Emp_ID, First_Name, Last_Name, Birth_Date)
VALUES(0005, Tim, Bogart, 03-05-77);
D.INSERT INTO Employee(Emp_ID, First_Name, Last_Name, Birth_Date)
VALUES(0005, Tim, Bogart, 03-05-77);
Correct Answers: D

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