WGU C175/D426 DATA MANAGEMENT
FOUNDATIONS OA EXAM NEWEST 2026
ACTUAL EXAM 2 LATEST VERSIONS 300
QUESTIONS AND CORRECT DETAILED
ANSWERS WITH RATIONALES (100% CORRECT
AND VERIFIED ANSWERS)|ALREADY GRADED
A+
What does Modality refers to? How does it appear on
ER diagram? - ANSWER--Refers to the MINIMUM
number of times an instance in one entity can be
associated with instance of another entity (minima).
Appears as a 0 or 1 on the relationship line, next to
cardinality.
Define: Referential Integrity - ANSWER--Requires that
ALL foreign key values must either be fully NULL or
match some primary key value.
4 Ways Referential Integrity can be violated - ANSWER-
-1. Primary key is updated 2. Foreign key is updated 3.
Row containing primary key is DELETED 4. Row
containing foreign key is INSERTED.
Actions to Correct Referential Integrity Violation -
ANSWER--1. RESTRICT - rejects an insert, update, or
,WGU C175/D426 DATA MANAGEMENT
FOUNDATIONS OA EXAM NEWEST 2026
ACTUAL EXAM 2 LATEST VERSIONS 300
QUESTIONS AND CORRECT DETAILED
ANSWERS WITH RATIONALES (100% CORRECT
AND VERIFIED ANSWERS)|ALREADY GRADED
A+
delete 2. SET NULL - sets invalid foreign keys to null 3.
SET DEFAULT - sets invalid foreign keys to a default
primary value 4. CASCADE - propagates primary key
changes to foreign keys.
What is an Important aspect of Referential Integrity -
ANSWER--Reference to data in one relation is based on
values in another relation.
What is Broad definition of data - ANSWER--Raw facts
captured on printed or digital media.
What Data - ANSWER--Facts that are collected and
stored in a database system.
Determining characteristic of unstructured data -
ANSWER--It does not follow a data model.
,WGU C175/D426 DATA MANAGEMENT
FOUNDATIONS OA EXAM NEWEST 2026
ACTUAL EXAM 2 LATEST VERSIONS 300
QUESTIONS AND CORRECT DETAILED
ANSWERS WITH RATIONALES (100% CORRECT
AND VERIFIED ANSWERS)|ALREADY GRADED
A+
Flat files - ANSWER--They contain no internal
hierarchical organization.
Data retrieval before database management systems -
ANSWER--Sequentially from simple files.
Primary Key - ANSWER--An attribute or group of
attributes that uniquely identify a tuple in a relation.
Foreign Key matching - ANSWER--A domain of values 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.
, WGU C175/D426 DATA MANAGEMENT
FOUNDATIONS OA EXAM NEWEST 2026
ACTUAL EXAM 2 LATEST VERSIONS 300
QUESTIONS AND CORRECT DETAILED
ANSWERS WITH RATIONALES (100% CORRECT
AND VERIFIED ANSWERS)|ALREADY GRADED
A+
Alternate Key - ANSWER--What uniquely identifies
each entity in a collection of entities but is not the
primary key.
Candidate Key - ANSWER--A set of columns in a table
that can uniquely identify any record in that table
without referring to other data.
Database indexing - ANSWER--The original data is
copied to the index.
Indexes in physical database design - ANSWER--To
retrieve data DIRECTLY using a pointer.
Index creation on a database column - ANSWER--To
optimize data retrievals.
FOUNDATIONS OA EXAM NEWEST 2026
ACTUAL EXAM 2 LATEST VERSIONS 300
QUESTIONS AND CORRECT DETAILED
ANSWERS WITH RATIONALES (100% CORRECT
AND VERIFIED ANSWERS)|ALREADY GRADED
A+
What does Modality refers to? How does it appear on
ER diagram? - ANSWER--Refers to the MINIMUM
number of times an instance in one entity can be
associated with instance of another entity (minima).
Appears as a 0 or 1 on the relationship line, next to
cardinality.
Define: Referential Integrity - ANSWER--Requires that
ALL foreign key values must either be fully NULL or
match some primary key value.
4 Ways Referential Integrity can be violated - ANSWER-
-1. Primary key is updated 2. Foreign key is updated 3.
Row containing primary key is DELETED 4. Row
containing foreign key is INSERTED.
Actions to Correct Referential Integrity Violation -
ANSWER--1. RESTRICT - rejects an insert, update, or
,WGU C175/D426 DATA MANAGEMENT
FOUNDATIONS OA EXAM NEWEST 2026
ACTUAL EXAM 2 LATEST VERSIONS 300
QUESTIONS AND CORRECT DETAILED
ANSWERS WITH RATIONALES (100% CORRECT
AND VERIFIED ANSWERS)|ALREADY GRADED
A+
delete 2. SET NULL - sets invalid foreign keys to null 3.
SET DEFAULT - sets invalid foreign keys to a default
primary value 4. CASCADE - propagates primary key
changes to foreign keys.
What is an Important aspect of Referential Integrity -
ANSWER--Reference to data in one relation is based on
values in another relation.
What is Broad definition of data - ANSWER--Raw facts
captured on printed or digital media.
What Data - ANSWER--Facts that are collected and
stored in a database system.
Determining characteristic of unstructured data -
ANSWER--It does not follow a data model.
,WGU C175/D426 DATA MANAGEMENT
FOUNDATIONS OA EXAM NEWEST 2026
ACTUAL EXAM 2 LATEST VERSIONS 300
QUESTIONS AND CORRECT DETAILED
ANSWERS WITH RATIONALES (100% CORRECT
AND VERIFIED ANSWERS)|ALREADY GRADED
A+
Flat files - ANSWER--They contain no internal
hierarchical organization.
Data retrieval before database management systems -
ANSWER--Sequentially from simple files.
Primary Key - ANSWER--An attribute or group of
attributes that uniquely identify a tuple in a relation.
Foreign Key matching - ANSWER--A domain of values 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.
, WGU C175/D426 DATA MANAGEMENT
FOUNDATIONS OA EXAM NEWEST 2026
ACTUAL EXAM 2 LATEST VERSIONS 300
QUESTIONS AND CORRECT DETAILED
ANSWERS WITH RATIONALES (100% CORRECT
AND VERIFIED ANSWERS)|ALREADY GRADED
A+
Alternate Key - ANSWER--What uniquely identifies
each entity in a collection of entities but is not the
primary key.
Candidate Key - ANSWER--A set of columns in a table
that can uniquely identify any record in that table
without referring to other data.
Database indexing - ANSWER--The original data is
copied to the index.
Indexes in physical database design - ANSWER--To
retrieve data DIRECTLY using a pointer.
Index creation on a database column - ANSWER--To
optimize data retrievals.
