Chapter 6

A table that has all key attributes defined, has no repeating groups, and all its attributes are dependent on the primary key is said to be in _____. 3NF 2NF 1NF 4NF

1NF

From a structural point of view, 2NF is better than _____. 4NF 1NF BCNF 3NF

1NF

Data warehouse routinely uses _____ structures in its complex, multilevel, multisource data environment. 1NF 4NF 3NF 2NF

2NF

From a structural point of view, 3NF is better than _____. 2NF 6NF 5NF 3NF

2NF

A table that is in 2NF and contains no transitive dependencies is said to be in _____. 1NF 4NF 2NF 3NF

3NF

A table where all attributes are dependent on the primary key but are independent of each other, and no row contains two or more multivalued facts about an entity is said to be in _____. 1NF 3NF 4NF 2NF

4NF

Some very specialized applications may require normalization beyond the _____. 3NF 4NF 1NF 2NF

4NF

To generate a surrogate key, Microsoft Access uses a(n) _____ data type. identity AutoNumber sequence character

AutoNumber

Of the following normal forms, _____ is mostly of theoretical interest. 1NF BCNF 3NF DKNF

DKNF

_____ databases reflect the ever-growing demand for greater scope and depth in the data on which decision support systems increasingly rely. Data warehouse Normalized Temporary Report

Data warehouse

A dependency of one nonprime attribute on another nonprime attribute is a partial dependency. True False

False

A table is in BCNF if every determinant in the table is a foreign key. True False

False

Data stored at their highest level of granularity are said to be atomic data. True False

False

Dependencies that are based on only a part of a composite primary key are called transitive dependencies. False True

False

Normalization is a process that is used for changing attributes to entities. True False

False

Normalization purity is often easy to sustain in the modern database environment. True False

False

A table is in fourth normal form if it is in third normal form and has no independent multivalued dependencies. False True

True

All relational tables satisfy the 1NF requirements. False True

True

Denormalization produces a lower normal form. False True

True

Dependency diagrams are very helpful in getting a bird's-eye view of all the relationships among a table's attributes. False True

True

In order to meet performance requirements, portions of the database design may need to be occasionally denormalized. False True

True

In the context of partial dependencies, data redundancies occur because every row entry requires duplication of data. True False

True

It is possible for a table in 2NF to exhibit transitive dependency, where the primary key may rely on one or more nonprime attributes to functionally determine other nonprime attributes. False True

True

Normalization represents a micro view of the entities within the ERD. True False

True

Normalization works through a series of stages called normal forms. True False

True

Relational models view data as part of a table or collection of tables in which all key values must be identified. True False

True

Repeating groups must be eliminated by ensuring that each row defines a single entity. False True

True

Since a partial dependency can exist only if a table's primary key is composed of several attributes, if a table in 1NF has a single-attribute primary key, then the table is automatically in 2NF. False True

True

The combination of normalization and ER modeling yields a useful ERD, whose entities can be translated into appropriate table structures. False True

True

The objective of normalization is to ensure that each table conforms to the concept of well-formed relations. False True

True

Improving _____ leads to more flexible queries. atomicity normalization derived attribute denormalization

atomicity

BCNF can be violated only if the table contains more than one _____ key. primary foreign secondary candidate

candidate

An atomic attribute _____. cannot exist in a relational table displays multiplicity cannot be further subdivided is always chosen to be a foreign key

cannot be further subdivided

In a(n) _____ diagram, the arrows above the attributes indicate all desirable dependencies. functionality dependency Chen ER

dependency

From a system functionality point of view, _____ attribute values can be calculated when they are needed to write reports or invoices. derived atomic granular historical

derived

Attribute A _____ attribute B if all of the rows in the table that agree in value for attribute A also agree in value for attribute B. determines owns controls derives from

determines

In a real-world environment, we must strike a balance between design integrity and _____. flexibility ease of use robustness uniqueness

flexibility

A table is in 4NF if it is in 3NF, and _____. all attributes must be dependent on the primary key and must be dependent on each other no column contains the same values it has no multivalued dependencies all attributes are unrelated

it has no multivalued dependencies

In a _____ situation, one key determines multiple values of two other attributes and those attributes are independent of each other. partial dependency functional dependency transitive dependency multivalued dependency

multivalued dependency

The most likely data type for a surrogate key is _____. character date logical numeric

numeric

Dependencies based on only a part of a composite primary key are known as _____ dependencies. incomplete primary partial composite

partial

If a table has multiple candidate keys and one of those candidate keys is a composite key, the table can have _____ based on this composite candidate key even when the primary key chosen is a single attribute. time-variances redundancies Boyce-Codd normal forms partial dependencies

partial dependencies

An attribute that is part of a key is known as a(n) _____ attribute. entity prime nonprime important

prime

A _____ derives its name from the fact that a collection of multiple entries of the same type can exist for any single key attribute occurrence. primary key transitive dependency partial dependency repeating group

repeating group

A relational table must not contain a(n) _____. entity repeating group attribute relationship

repeating group

An example of denormalization is using a _____ denormalized table to hold report data. This is required when creating a tabular report in which the columns represent data that are stored in the table as rows. transitive component 3NF temporary

temporary

When a table contains only one candidate key, _____ are considered to be equivalent. the 4NF and the 3NF the 3NF and the BCNF the 1NF and the 2NF the BCNF and the DKNF

the 3NF and the BCNF

Granularity refers to _____. the size of a table the level of detail represented by the values in a table's row the number of attributes represented in a table the number of rows in a table

the level of detail represented by the values in a table's row

Normalization works through a series of stages called normal forms. For most purposes in business database design, _____ stages are as high as you need to go in the normalization process. two four five three

three

A(n) _____ exists when there are functional dependencies such that Y is functionally dependent on X, Z is functionally dependent on Y, and X is the primary key. atomic attribute partial dependency transitive dependency repeating group

transitive dependency