Deck 4: Logical Database Design and the Relational Model

Question 1

Data is represented in the form of:

A) data trees.
B) tables.
C) data notes.
D) chairs.

Answer 1

B

Question 2

A domain definition consists of all of the following components EXCEPT:

A) domain name.
B) data type.
C) integrity constraints.
D) size.

Answer 2

C

Question 3

In the figure below, Customer_ID in the CUSTOMER Table is which type of key?

A) Composite
B) Candidate
C) Standard
D) Grouped

Answer 3

B

Question 4

An attribute (or attributes) that uniquely identifies each row in a relation is called a:

A) column.
B) foreign field.
C) primary key.
D) duplicate key.

Question 5

An attribute in a relation of a database that serves as the primary key of another relation in the same database is called a:

A) link attribute.
B) link key.
C) foreign key.
D) foreign attribute.

Question 6

A two-dimensional table of data sometimes is called a:

A) group.
B) set.
C) declaration.
D) relation.

Question 7

Which of the following is NOT a reason to create an instance of a relational schema with sample data?

A) Sample data can be used to improve user communications.
B) Sample data can be used for prototype generation.
C) Sample data can reverse database implementation errors.
D) Sample data provide a convenient way to check the accuracy of your design.

Question 8

________ is a component of the relational data model included to specify business rules to maintain the integrity of data when they are manipulated.

A) Business rule constraint
B) Data integrity
C) Business integrity
D) Data structure

Question 9

A primary key that consists of more than one attribute is called a:

A) foreign key.
B) composite key.
C) multivalued key.
D) cardinal key.

Question 10

A primary key whose value is unique across all relations is called a(n):

A) global primary key.
B) inter-table primary key.
C) enterprise key.
D) foreign global key.

Question 11

The normal form which removes any remaining functional dependencies because there was more than one primary key for the same nonkeys is called:

A) fifth normal form.
B) fourth normal form.
C) Boyce-Codd normal form.
D) sixth normal form.

Question 12

The entity integrity rule states that:

A) no primary key attribute can be null.
B) referential integrity must be maintained across all entities.
C) each entity must have a primary key.
D) a primary key must have only one attribute.

Question 13

The ________ states that no primary key attribute may be null.

A) referential integrity constraint
B) entity integrity rule
C) partial specialization rule
D) range domain rule

Question 14

In the SQL language, the ________ statement is used to make table definitions.

A) create session
B) create table
C) create index
D) select

Question 15

Which of the following are properties of relations?

A) Each attribute has the same name.
B) No two rows in a relation are identical.
C) There are multivalued attributes in a relation.
D) All columns are numeric.

Question 16

All of the following are the main goals of normalization EXCEPT:

A) minimize data redundancy.
B) simplify the enforcement of referential integrity.
C) maximize storage space.
D) make it easier to maintain data.

Question 17

A form of database design which maps conceptual requirements is called:

A) logical designs.
B) response designs.
C) security design.
D) physical design.

Question 18

Which of the following violates the atomic property of relations?

A) Sam
B) Hinz
C) Sam Hinz
D) Atomic

Question 19

When all multivalued attributes have been removed from a relation, it is said to be in:

A) first normal form.
B) second normal form.
C) Boyce-Codd normal form.
D) third normal form.

Question 20

In the figure below, the primary key for "Order Line" is which type of key?

A) Composite
B) Foreign
C) Standard
D) Grouped

Question 21

________ problems are encountered when removing data with transitive dependencies.

A) Insertion
B) Modification
C) Deletion
D) Merging

Question 22

A functional dependency in which one or more nonkey attributes are functionally dependent on part, but not all, of the primary key is called a ________ dependency.

A) partial key-based
B) partial functional
C) cross key
D) merged relation

Question 23

In the figure below, what type of relationship do the relations depict?

A) Identifying entity/weak entity
B) Multivalued
C) Composite foreign key
D) One-to-many

Question 24

The attribute on the left-hand side of the arrow in a functional dependency is the:

A) candidate key.
B) determinant.
C) foreign key.
D) primary key.

Question 25

A constraint between two attributes is called a(n):

A) functional relation.
B) attribute dependency.
C) functional dependency.
D) functional relation constraint.

Question 26

A nonkey attribute is also called a(n):

A) column.
B) unimportant datum.
C) descriptor.
D) address.

Question 27

An attribute that may have more than one meaning is called a(n):

A) homonym.
B) alias.
C) double defined attribute.
D) synonym.

Question 28

A candidate key must satisfy all of the following conditions EXCEPT:

A) the key must uniquely identify the row.
B) the key must indicate the row's position in the table.
C) the key must be nonredundant.
D) each nonkey attribute is functionally dependent upon it.

Question 29

In the figure below, what is depicted?

A) A one-to-one relationship
B) A unary relationship
C) A one-to-many relationship
D) An associative entity

Question 30

When a regular entity type contains a multivalued attribute, one must:

A) create a single relation with multiple lines for each instance of the multivalued attribute.
B) create two new relations, one containing the multivalued attribute.
C) create two new relations, both containing the multivalued attribute.
D) delete the relation and start over.

Question 31

Two or more attributes having different names but the same meaning are called:

A) homonyms.
B) aliases.
C) synonyms.
D) alternate attributes.

Question 32

The need to ________ relations commonly occurs when different views need to be integrated.

A) metadata
B) system
C) drop
D) merge

Question 33

In the figure below, what type of key is depicted?

A) Primary
B) Recursive primary
C) Composite
D) Recursive foreign

Question 34

In the figure below, what type of relationship do the relations depict?

A) Identifying entity/weak entity
B) One-to-many
C) Ternary
D) Many-to-many

Question 35

A relation that contains no multivalued attributes and has nonkey attributes solely dependent on the primary key but contains transitive dependencies is in which normal form?

A) First
B) Second
C) Third
D) Fourth

Question 36

Referring to the figure below, which of the following is NOT true?

A) A component is part of an item.
B) A component is always used in only one item.
C) A component can be part of an item.
D) A component may be used in many items.

Question 37

An alternative name for an attribute is called a(n):

A) synonym.
B) alias.
C) alternate attribute.
D) related characteristic.

Question 38

A functional dependency between two or more nonkey attributes is called a:

A) partial functional dependency.
B) partial nonkey dependency.
C) transitive dependency.
D) partial transitive dependency.

Question 39

The normal form which deals with multivalued dependencies is called:

A) fifth normal form.
B) fourth normal form.
C) Boyce-Codd normal form.
D) sixth normal form.

Question 40

Understanding the steps involved in transforming EER diagrams into relations is important because:

A) one must be able to check the output of a CASE tool.
B) there are rarely legitimate alternatives from which to choose.
C) CASE tools can model any situation.
D) CASE tools model hypothetical business problems.

Question 41

A foreign key is a primary key of a relation that also is a primary key in another relation.

Question 42

The columns of a relation can be interchanged without changing the meaning or use of the relation.

Question 43

A primary key is an attribute that uniquely identifies each row in a relation.

Question 44

One property of a relation is that each attribute within a relation has a unique name.

Question 45

When a regular entity type contains a multivalued attribute, two new relations are created.

Question 46

There can be multivalued attributes in a relation.

Question 47

Unlike columns, the rows of a relation may not be interchanged and must be stored in one sequence.

Question 48

A rule that states that each foreign key value must match a primary key value in the other relation is called the:

A) referential integrity constraint.
B) key match rule.
C) entity key group rule.
D) foreign/primary match rule.

Question 49

CASE tools can model more complex data relationships, such as ternary relationships.

Question 50

When two or more attributes describe the same characteristic of an entity, they are synonyms.

Question 51

________ anomalies can be caused by editing data in tables.

A) Insertion
B) Deletion
C) Modification
D) Creation

Question 52

View integration is the process of merging relations together.

Question 53

A relation that contains minimal redundancy and allows easy use is considered to be:

A) clean.
B) simple.
C) complex.
D) well-structured.

Question 54

A composite key consists of only one attribute.

Question 55

A synonym is an attribute that may have more than one meaning.

Question 56

All values that appear in a column of a relation must be taken from the same domain.

Question 57

Data structures include data organized in the form of tables with rows and columns.

Question 58

An enterprise key is a foreign key whose value is unique across all relations.

Question 59

The figure below is an example of mapping which type of relationship?

A) First
B) Second
C) Unary
D) Ternary

Question 60

Sample data are useful for developing prototype applications and for testing queries.

Question 61

When transforming a one-to-one relationship, a new relation is always created.

Question 62

The entity integrity rule states that a primary key attribute can be null.

Question 63

In the figure below, each employee has exactly one manager.

Question 64

An identifier assigned to an associative entity is also called a cross-relation key.

Question 65

In the relational data model, associations between tables are defined through the use of primary keys.

Question 66

A cascading delete removes all records in other tables associated with the record to be deleted.

Question 67

The truncate table statement in SQL creates a new table.

Question 68

A co-dependency is a constraint between two attributes or two sets of attributes.

Question 69

When transforming a weak entity, one should create one relation with both the attributes of the strong entity and the attributes of the weak entity.

Question 70

A well-structured relation contains minimal redundancy and allows users to manipulate the relation without errors or inconsistencies.

Question 71

Data integrity consists of powerful operations to manipulate data stored in relations.

Question 72

A relation in fifth normal form may not contain any anomalies.

Question 73

An anomaly is a type of flaw in the database server.

Question 74

The primary key of the many side migrates to the one side when transforming a one-to-many relationship.

Question 75

When transforming a unary many-to-many relationship to relations, a recursive foreign key is used.

Question 76

A referential integrity constraint is a rule that maintains consistency among the rows of two relations.

Question 77

If an identifier is not assigned, the default primary key for an associative relation consists of the two primary key attributes from the other two relations.

Question 78

The allowable range of values for a given attribute is part of the domain constraint.

Question 79

The relational data model does, at this time, directly support subtype/supertype relationships.

Question 80

When normalizing, the goal is to decompose relations with anomalies to produce smaller, well-structured relations.