Data Management Foundations Pre Tests

Where does affinity grouping occur in data mining?

Among entities and target applications

Between entity group names

Between objects

Among clusters

C

How is prediction distinguished from estimation in data mining?

Prediction is used to look at historical data only.

Estimation assumptions do not need to be tested.

Prediction classifies objects according to an expected future behavior.

Estimation divides small collections of entities into smaller groups of similar entities.

C

During which step in the extract, transform, load (ETL) process are raw data sets aggregated?

Loading

Extraction

Conversion

Transformation

Denormalization

D

Which issue is focused on the loading component of extract, transform, load (ETL)?

Monitor refreshing volume and frequency

Denormalizing and renormalizing the data

Mapping keys from one system to another

Determining the content of the data

A

Which set of results should a company expect from implementing a business intelligence system?

Increased profitability and increased throughput

Reduced hardware redundancy and decreased workloads

Increased profitability and reduced hardware redundancy

Riskier capital and asset investments and increased throughput

A

C

Which characteristic points to the tables being in third normal form?

Each primary key has a functional dependency on every other primary key in the table.

"Salesperson Number" appears in more than one table.

The tables are completely free of data redundancy.

The attributes are all single valued.

D

The primary key in the first table is ID, and the primary key in the second is Code.

How advanced are the two tables in the normalization process?

Unnormalized

First normal form

Second normal form

Third normal form

C

Which factor determines whether the table is in first normal form?

There are no functional dependencies.

The fourth column shows the foreign keys.

The attributes are all single valued.

The first column is in numerical order

B

In which state are the attributes shown?

Unnormalized

First normal form

Second normal form

Third normal form

What is the term for the value of one particular attribute associated with a specific single value of another attribute?

Functional dependency

Transitive dependency

Decomposition

Normalization

A

What is a methodology for organizing attributes into tables?

Data normalization

Data redundancy

Data indexing

Data compression

A

Why is an index created on a database column?

To optimize data integrity

To optimize data updates

To optimize data retrievals

To optimize data insertions

C

Why are indexes created in a physical database design?

To group data into aggregations

To iterate across data in a sequence

To retrieve data directly using a pointer

To summarize data into dimensions for a cube

C

What happens to the original data in database indexing?

It is moved to the index.

It is copied to the index.

It is compiled by the DBMS.

It is translated into hexadecimals.

B

What is a term for a set of columns in a table that can uniquely identify any record in that table without referring to other data?

Foreign key

Primary key

Alternate key

Candidate key

D

What uniquely identifies each entity in a collection of entities but is not the primary key?

The foreign key

The secondary key

The alternate key

The master key

C

What is necessary for a primary key in one relation of a database to match with its corresponding foreign key in another relation of the same database?

A domain of values

Intersection data

An attribute name

A quantity

A

What is an attribute or group of attributes that uniquely identify a tuple in a relation?

Index key

Foreign key

Primary key

Physical key

C

Sales data, detailing the customer names, products sold, and salespersons, is kept in a database.

Which kind of data in this database would qualify as intersection data related to both the product and salesperson entities?

Quantity

Products

Salespersons

Customer names

D

In which two ways does a database management system environment increase effectiveness in working with data?

It enables data sharing.

It duplicates redundant data for security.

It permits storage of vast volumes of data.

It increases the complexity rules by which data is organized.

A, C

A product-marketing company publishes an Internet-based newsletter about their new products to increase their customer base.

What is an advantage that this company will gain from investing in a relational database management system that will store customer information?

Increased sales

Lower advertising costs

Improved query response times

Decreased skill acquisition times

C

Refer to the given SQL statement to answer the following question:

SELECT *

FROM PRODUCT;

What would this SQL statement accomplish?

List all PRODUCT from the * table.

Delete all products from the PRODUCT table view.

Delete all entries in the PRODUCT table.

List all entries in the PRODUCT table.

D

B

The given SQL statement is intended to query how many books there are with at least 800 pages from publishers in Los Angeles, United States.

With which line should the question mark in this statement be replaced?

FROM PUBNAME.BOOK

FROM PUBLISHER, BOOK

WHERE PUBNAME = BOOK

WHERE PUBLISHER = BOOK

B

The given SQL statement is intended to list the names of the products of which salesperson Fox has sold more than 500 units.

Which set of lines should replace the question marks to make this statement work?

WHERE SALESPERSON.SPNUM=PRODUCT.PRODNUM AND SALES.PRODNUM=PRODUCT.PRODNUM

WHERE SALESPERSON.SPNUM=SALES.SPNUM AND SALES.PRODNUM=PRODUCT.PRODNUM

WHERE SALESPERSON.SPNUM>SALES.SPNUM AND SALES.PRODNUM=PRODUCT.PRODNUM

WHERE SALESPERSON.SPNUM=SALES.SPNUM AND SALES.PRODNUM=SALES.SPNUM

Which SQL statement alphabetizes customer names within the same satellite-office city?

ORDER BY CUSTNAME, SATCITY;

ALPHA BY CUSTNAME, SATCITY;

ORDER BY SATCITY, CUSTNAME;

ALPHA BY SATCITY, CUSTNAME;

C

What is a key difference between the DISTINCT and ORDER BY statements, in SQL SELECT commands?

ORDER BY does not alter the presentation of data results and DISTINCT modifies data results.

ORDER BY modifies the presentation of data results and DISTINCT filters data results.

ORDER BY changes the order of results in the database and DISTINCT changes the order of results in the view only.

ORDER BY changes the order of results in the view only and DISTINCT changes the order of results in the database.

B

A

A manager asks an employee to list attributes of the customers that are headquartered in Los Angeles and that have a customer number higher than 1000. Refer to the given SQL statement prepared by this employee.

Which line should go at the end of this statement?

AND CUSTNUM>1000;

AND CUSTNUM>=1000;

WHERE CUSTNUM<1000

WHERE CUSTNUM>=1000;

B

Refer to the given SQL statement.

How should this statement be altered to retrieve the entire record instead of the commission percentage and year of hire?

Replace WHERE SPNUM=22; with WHERE SPNUM=*

Replace COMMPERCT, YEARHIRE with an asterisk

Replace COMMPERCT, YEARHIRE with ALL

Replace SALESPERSON with ALL

D

Refer to the given SQL statement.

What is the correct line to add to the end of this statement to find salespersons with a commission percentage of 15?

* COMMPERCT=15;

IF COMMPERCT=15;

AND COMMPERCT=15;

WHERE COMMPERCT=15;

What is an important aspect of "referential integrity"?

Primary keys refer to data in particular relation.

Reference points are placed by the database in each record during backups.

The relationships between entities and attributes are called referrals.

Reference to data in one relation is based on values in another relation.

D

Which three kinds of rules for referential integrity are provided by modern relational database management systems?

Sort

Insert

Query

Delete

Update

Retrieve

B, D, E

C

Which kind of relationship does this diagram depict?

Unary one-to-many

Binary one-to-many

Unary many-to-many

Binary many-to-many

A

Which kind of relationship does this diagram depict?

Unary one-to-one

Binary one-to-one

Unary one-to-many

Binary one-to-many

B

What is the modality of the product?

Two

At least one

Two or more

Dependent on the quantity

C

What is the correct way to read the modality on the right side of the association?

A maximum of one customer

A maximum of many customers

A minimum of zero customers

A maximum of zero customers

B

How is the cardinality of the customers misrepresented?

There is one customer number, but the cardinality indicates many customers.

There are many customers, but the cardinality indicates one customer.

There is more than one salesperson, but the cardinality indicates multiple salespersons.

The cardinality of the salesperson number and the customer number do not match.

A

Which relationship does the cardinality in the diagram represent?

Many customers to many products

One customer to many products

One customer to many product numbers

One customer to one product number

Many customers to one product

A salesperson is authorized to sell 12 products; a product can be sold by 10 salespersons.

Which kind of binary relationship is described in this example?

One-to-one

One-to-many

Many-to-many

Associative

C

B

What is the entity-relationship diagram about a car rental agency showing?

An agency's cars were provided by multiple manufacturers.

One manufacturer created at least one of the agency's cars.

The model, year, and class of the car are part of the primary key.

The manufacturer maintains database records for its sales representatives.

Which data classification is an entity?

Event

Duration

Directions

Attendance

A

C

Which classification is correct for the box marked "Quantity" in the given entity-relationship diagram?

Quantity data

Modality data

Intersection data

Product sales data

What is the uniquely identifiable element about which data can be categorized in an entity-relationship diagram?

Entity types

Primary keys

Unary relationships

Intersection data points

A

How were data retrieved before database management systems?

Randomly from linked files

Sequentially from simple files

Using set operations on complex files

Using relationships between logical entities

B

Which technology has no internal hierarchy?

Flat files

Heap files

Hashed tables

Relational databases

A

Which is true about flat files?

They contain no internal hierarchical organization.

They have a limit of 256 records.

They can only contain two-dimensional data.

They are always encrypted.

A

A

Which item represents unstructured data?

A

B

C

D

What is a determining characteristic of unstructured data?

It does not allow copying and pasting.

It is easy to query and retrieve by business applications.

It does not follow a data model.

It is stored in rows and columns.

C

What are data?

Facts that have been organized in a meaningful way

Facts that are the result of a query of a database system

Facts that are collected and stored in a database system

Facts that have been processed and used for decision making

C

What are data?

Facts that have been organized in a meaningful way

Facts that are the result of a query of a database system

Facts that are collected and stored in a database system

Facts that have been processed and used for decision making

B