WGU C175 / D426 Data Management Foundations OA
Complete Study Guide | 2025 Latest Exam Review with 60+
Practice Questions, Accurate Answers, and Key Data
Concepts Explained
1. Which of the following is a primary benefit of database normalization?
A) Increased redundancy
B) Reduced data anomalies
C) Faster data retrieval
D) Simplified queries
Rationale: Normalization reduces data anomalies by organizing data into related
tables, which minimizes redundancy and ensures data integrity.
2. In a relational database, what does ACID stand for?
A) Atomicity, Consistency, Isolation, Durability
B) Accuracy, Consistency, Integrity, Durability
C) Atomicity, Concurrency, Isolation, Data integrity
D) Analysis, Consistency, Isolation, Durability
Rationale: ACID properties (Atomicity, Consistency, Isolation, Durability) ensure
reliable processing of database transactions.
3. Which of the following SQL clauses is used to filter records in a query?
A) SELECT
B) WHERE
C) GROUP BY
D) ORDER BY
Rationale: The WHERE clause filters records in a SQL query based on specified
conditions.
4. What type of join returns all records from both tables and fills in NULLs for
non-matching records?
A) Inner Join
B) Left Join
C) Full Outer Join
D) Right Join
Rationale: A Full Outer Join returns all records from both tables, with NULLs for non-
matching records, providing a complete view of both datasets.
5. In a data warehouse, what is the purpose of the ETL process?
A) Extract, Transform, Load
,WGU C175 / D426 Data Management Foundations OA
Complete Study Guide | 2025 Latest Exam Review with 60+
Practice Questions, Accurate Answers, and Key Data
Concepts Explained
B) Extract, Transfer, Load
C) Evaluate, Transform, Load
D) Extract, Transform, Link
Rationale: ETL (Extract, Transform, Load) is the process used to gather data from
various sources, transform it into a suitable format, and load it into a data warehouse.
6. Which of the following describes a "star schema"?
A) A schema with multiple fact tables
B) A central fact table connected to multiple dimension tables
C) A flat structure with no dimensions
D) A schema with hierarchies
Rationale: A star schema features a central fact table linked to multiple dimension
tables, facilitating efficient querying and reporting.
7. What is the main purpose of a data governance framework?
A) To manage data storage costs
B) To ensure data quality and compliance
C) To improve system performance
D) To enhance user access
Rationale: A data governance framework is designed to ensure data quality,
compliance, and effective management throughout the organization.
8. Which of the following is an example of a NoSQL database?
A) MySQL
B) MongoDB
C) PostgreSQL
D) Oracle
Rationale: MongoDB is a NoSQL database that stores data in flexible, JSON-like
documents, allowing for dynamic schemas and scalability.
9. Which type of database is designed to handle unstructured data?
A) Relational Database
B) Hierarchical Database
C) NoSQL Database
D) Object-Oriented Database
,WGU C175 / D426 Data Management Foundations OA
Complete Study Guide | 2025 Latest Exam Review with 60+
Practice Questions, Accurate Answers, and Key Data
Concepts Explained
Rationale: NoSQL databases are optimized for unstructured data, making them
suitable for applications requiring flexibility in data formats.
10. What is the primary function of a data dictionary?
A) Store all data
B) Provide data backup
C) Describe the structure and attributes of data
D) Manage data access
Rationale: A data dictionary contains metadata describing the structure, relationships,
and attributes of the data in a database.
11. What is a major drawback of using a flat file database?
A) High performance
B) Easy integration
C) Data redundancy
D) Simple design
Rationale: Flat file databases often lead to data redundancy, as the same data can be
stored in multiple locations, making it inefficient for larger datasets.
12. Which SQL command is used to modify existing records in a table?
A) INSERT
B) UPDATE
C) DELETE
D) SELECT
Rationale: The UPDATE command is used to modify existing records in a database
table.
13. What does the term "data warehouse" refer to?
A) A temporary storage solution
B) A data processing technique
C) A centralized repository for historical data
D) A type of database management system
Rationale: A data warehouse is a centralized repository that stores historical data for
analysis and reporting purposes.
, WGU C175 / D426 Data Management Foundations OA
Complete Study Guide | 2025 Latest Exam Review with 60+
Practice Questions, Accurate Answers, and Key Data
Concepts Explained
14. Which of the following best describes data mining?
A) Storing data
B) Analyzing data to discover patterns
C) Transferring data
D) Cleaning data
Rationale: Data mining involves analyzing large datasets to identify patterns, trends,
and insights.
15. What does the term "referential integrity" ensure?
A) Data accuracy
B) Data security
C) Consistency of relationships between tables
D) Data accessibility
Rationale: Referential integrity ensures that relationships between tables remain
consistent, preventing orphaned records.
16. In a relational database, what is a "composite key"?
A) A key that consists of multiple columns
B) A key that is automatically generated
C) A single-column primary key
D) A foreign key from another table
Rationale: A composite key is a primary key that consists of two or more columns used
together to uniquely identify a record.
17. Which SQL statement is used to remove a table from a database?
A) DELETE
B) DROP
C) REMOVE
D) TRUNCATE
Rationale: The DROP statement is used to remove an entire table, along with its data,
from a database.
18. What is the main characteristic of a column-family NoSQL database?
A) Uses fixed schemas
B) Stores data in columns instead of rows
Complete Study Guide | 2025 Latest Exam Review with 60+
Practice Questions, Accurate Answers, and Key Data
Concepts Explained
1. Which of the following is a primary benefit of database normalization?
A) Increased redundancy
B) Reduced data anomalies
C) Faster data retrieval
D) Simplified queries
Rationale: Normalization reduces data anomalies by organizing data into related
tables, which minimizes redundancy and ensures data integrity.
2. In a relational database, what does ACID stand for?
A) Atomicity, Consistency, Isolation, Durability
B) Accuracy, Consistency, Integrity, Durability
C) Atomicity, Concurrency, Isolation, Data integrity
D) Analysis, Consistency, Isolation, Durability
Rationale: ACID properties (Atomicity, Consistency, Isolation, Durability) ensure
reliable processing of database transactions.
3. Which of the following SQL clauses is used to filter records in a query?
A) SELECT
B) WHERE
C) GROUP BY
D) ORDER BY
Rationale: The WHERE clause filters records in a SQL query based on specified
conditions.
4. What type of join returns all records from both tables and fills in NULLs for
non-matching records?
A) Inner Join
B) Left Join
C) Full Outer Join
D) Right Join
Rationale: A Full Outer Join returns all records from both tables, with NULLs for non-
matching records, providing a complete view of both datasets.
5. In a data warehouse, what is the purpose of the ETL process?
A) Extract, Transform, Load
,WGU C175 / D426 Data Management Foundations OA
Complete Study Guide | 2025 Latest Exam Review with 60+
Practice Questions, Accurate Answers, and Key Data
Concepts Explained
B) Extract, Transfer, Load
C) Evaluate, Transform, Load
D) Extract, Transform, Link
Rationale: ETL (Extract, Transform, Load) is the process used to gather data from
various sources, transform it into a suitable format, and load it into a data warehouse.
6. Which of the following describes a "star schema"?
A) A schema with multiple fact tables
B) A central fact table connected to multiple dimension tables
C) A flat structure with no dimensions
D) A schema with hierarchies
Rationale: A star schema features a central fact table linked to multiple dimension
tables, facilitating efficient querying and reporting.
7. What is the main purpose of a data governance framework?
A) To manage data storage costs
B) To ensure data quality and compliance
C) To improve system performance
D) To enhance user access
Rationale: A data governance framework is designed to ensure data quality,
compliance, and effective management throughout the organization.
8. Which of the following is an example of a NoSQL database?
A) MySQL
B) MongoDB
C) PostgreSQL
D) Oracle
Rationale: MongoDB is a NoSQL database that stores data in flexible, JSON-like
documents, allowing for dynamic schemas and scalability.
9. Which type of database is designed to handle unstructured data?
A) Relational Database
B) Hierarchical Database
C) NoSQL Database
D) Object-Oriented Database
,WGU C175 / D426 Data Management Foundations OA
Complete Study Guide | 2025 Latest Exam Review with 60+
Practice Questions, Accurate Answers, and Key Data
Concepts Explained
Rationale: NoSQL databases are optimized for unstructured data, making them
suitable for applications requiring flexibility in data formats.
10. What is the primary function of a data dictionary?
A) Store all data
B) Provide data backup
C) Describe the structure and attributes of data
D) Manage data access
Rationale: A data dictionary contains metadata describing the structure, relationships,
and attributes of the data in a database.
11. What is a major drawback of using a flat file database?
A) High performance
B) Easy integration
C) Data redundancy
D) Simple design
Rationale: Flat file databases often lead to data redundancy, as the same data can be
stored in multiple locations, making it inefficient for larger datasets.
12. Which SQL command is used to modify existing records in a table?
A) INSERT
B) UPDATE
C) DELETE
D) SELECT
Rationale: The UPDATE command is used to modify existing records in a database
table.
13. What does the term "data warehouse" refer to?
A) A temporary storage solution
B) A data processing technique
C) A centralized repository for historical data
D) A type of database management system
Rationale: A data warehouse is a centralized repository that stores historical data for
analysis and reporting purposes.
, WGU C175 / D426 Data Management Foundations OA
Complete Study Guide | 2025 Latest Exam Review with 60+
Practice Questions, Accurate Answers, and Key Data
Concepts Explained
14. Which of the following best describes data mining?
A) Storing data
B) Analyzing data to discover patterns
C) Transferring data
D) Cleaning data
Rationale: Data mining involves analyzing large datasets to identify patterns, trends,
and insights.
15. What does the term "referential integrity" ensure?
A) Data accuracy
B) Data security
C) Consistency of relationships between tables
D) Data accessibility
Rationale: Referential integrity ensures that relationships between tables remain
consistent, preventing orphaned records.
16. In a relational database, what is a "composite key"?
A) A key that consists of multiple columns
B) A key that is automatically generated
C) A single-column primary key
D) A foreign key from another table
Rationale: A composite key is a primary key that consists of two or more columns used
together to uniquely identify a record.
17. Which SQL statement is used to remove a table from a database?
A) DELETE
B) DROP
C) REMOVE
D) TRUNCATE
Rationale: The DROP statement is used to remove an entire table, along with its data,
from a database.
18. What is the main characteristic of a column-family NoSQL database?
A) Uses fixed schemas
B) Stores data in columns instead of rows
