WGU D465 DATA APPLICATIONS EXAM OA TEST BANK
2026 EXAM QUESTIONS AND ANSWERS WITH A
STUDY GUIDE VERIFIED FOR GUARANTEED PASS
LATEST UPDATE
1. San Francisco, CA 94110
USA
How many attributes are present in the address fragment?**
1
2
3
4 – CORRECT ANSWER 4
Rationale:
Each independent piece of data represents a separate attribute: City (San Francisco), State (CA),
ZIP Code (94110), and Country (USA). Each could be stored in its own database field.
2. The Package table has the following columns:
Weight—decimal
Description—optional variable length string
LastChangedDate—date
TrackingNumber—integer
Which column should be designated the primary key for the Package table?
1
,WGU D465 DATA APPLICATIONS EXAM OA TEST BANK
2026 EXAM QUESTIONS AND ANSWERS WITH A
STUDY GUIDE VERIFIED FOR GUARANTEED PASS
LATEST UPDATE
Weight
Description
LastChangedDate
TrackingNumber – CORRECT ANSWER TrackingNumber
Rationale:
A primary key must uniquely identify each row. TrackingNumber is intended to be unique,
whereas weight, description, and dates can repeat across multiple packages.
3. Which data type will store "2022-01-10 14:22:12" as a temporal value without loss of
information?
DATE
DATETIME
DECIMAL
BIGINT – CORRECT ANSWER DATETIME
Rationale:
DATETIME stores both the date and the time components. DATE would drop the time portion,
and DECIMAL or BIGINT are not temporal data types.
4. Which SQL command is an example of data definition language (DDL)?
UPDATE
,WGU D465 DATA APPLICATIONS EXAM OA TEST BANK
2026 EXAM QUESTIONS AND ANSWERS WITH A
STUDY GUIDE VERIFIED FOR GUARANTEED PASS
LATEST UPDATE
ALTER
SELECT
2
, DELETE – CORRECT ANSWER CREATE, ALTER, OR DROP
Rationale:
DDL commands define or modify database structures. CREATE, ALTER, and DROP change the
schema, whereas UPDATE, SELECT, and DELETE manipulate data.
5. How would a database engine process an update that violates a RESTRICT referential
integrity constraint?
The offending value would be set to the database default.
The update would be rejected by the database.
The offending value would be changed to NULL.
The updated value would flow to the primary key. – CORRECT ANSWER The update
would be rejected by the database
Rationale:
RESTRICT prevents changes that would violate referential integrity. If the update breaks a
foreign key relationship, the database blocks the operation entirely.
6. Which restriction applies when using a materialized view?
The users of the view must provide search terms.
The underlying data must be periodically refreshed.
The tables referenced in the view must be indexed.
The rows in the table must be compressed. – CORRECT ANSWER The underlying
data must be periodically refreshed
3
2026 EXAM QUESTIONS AND ANSWERS WITH A
STUDY GUIDE VERIFIED FOR GUARANTEED PASS
LATEST UPDATE
1. San Francisco, CA 94110
USA
How many attributes are present in the address fragment?**
1
2
3
4 – CORRECT ANSWER 4
Rationale:
Each independent piece of data represents a separate attribute: City (San Francisco), State (CA),
ZIP Code (94110), and Country (USA). Each could be stored in its own database field.
2. The Package table has the following columns:
Weight—decimal
Description—optional variable length string
LastChangedDate—date
TrackingNumber—integer
Which column should be designated the primary key for the Package table?
1
,WGU D465 DATA APPLICATIONS EXAM OA TEST BANK
2026 EXAM QUESTIONS AND ANSWERS WITH A
STUDY GUIDE VERIFIED FOR GUARANTEED PASS
LATEST UPDATE
Weight
Description
LastChangedDate
TrackingNumber – CORRECT ANSWER TrackingNumber
Rationale:
A primary key must uniquely identify each row. TrackingNumber is intended to be unique,
whereas weight, description, and dates can repeat across multiple packages.
3. Which data type will store "2022-01-10 14:22:12" as a temporal value without loss of
information?
DATE
DATETIME
DECIMAL
BIGINT – CORRECT ANSWER DATETIME
Rationale:
DATETIME stores both the date and the time components. DATE would drop the time portion,
and DECIMAL or BIGINT are not temporal data types.
4. Which SQL command is an example of data definition language (DDL)?
UPDATE
,WGU D465 DATA APPLICATIONS EXAM OA TEST BANK
2026 EXAM QUESTIONS AND ANSWERS WITH A
STUDY GUIDE VERIFIED FOR GUARANTEED PASS
LATEST UPDATE
ALTER
SELECT
2
, DELETE – CORRECT ANSWER CREATE, ALTER, OR DROP
Rationale:
DDL commands define or modify database structures. CREATE, ALTER, and DROP change the
schema, whereas UPDATE, SELECT, and DELETE manipulate data.
5. How would a database engine process an update that violates a RESTRICT referential
integrity constraint?
The offending value would be set to the database default.
The update would be rejected by the database.
The offending value would be changed to NULL.
The updated value would flow to the primary key. – CORRECT ANSWER The update
would be rejected by the database
Rationale:
RESTRICT prevents changes that would violate referential integrity. If the update breaks a
foreign key relationship, the database blocks the operation entirely.
6. Which restriction applies when using a materialized view?
The users of the view must provide search terms.
The underlying data must be periodically refreshed.
The tables referenced in the view must be indexed.
The rows in the table must be compressed. – CORRECT ANSWER The underlying
data must be periodically refreshed
3
