WGU D351 FINAL EXAM Rapid Revision + Practice
Test Newest Update 2026 | Most Asked 250 Questions
And Verified Answers | A+ Success Kit”
1. What is the primary purpose of a database management system (DBMS)?
A. To create operating systems
B. To store, manage, and retrieve data efficiently
C. To design hardware components
D. To compile programming languages
Explanation: A DBMS is designed to handle structured data storage, retrieval, and
management.
2. Which of the following best describes data integrity?
A. Speed of data processing
B. Accuracy and consistency of stored data
C. Data encryption method
D. File compression technique
Explanation: Data integrity ensures that data remains accurate and reliable over its
lifecycle.
3. What is a primary key in a database table?
A. A field that allows duplicate values
B. A temporary data identifier
C. A unique identifier for each record
D. A foreign reference key
Explanation: A primary key uniquely identifies each record in a table.
4. Which SQL command is used to retrieve data from a database?
A. INSERT
B. UPDATE
C. SELECT
D. DELETE
Explanation: SELECT is used to query and retrieve data.
,5. What does normalization in databases aim to achieve?
A. Increase redundancy
B. Encrypt data
C. Reduce data redundancy and improve integrity
D. Delete unnecessary tables
Explanation: Normalization organizes data efficiently to reduce duplication.
6. Which of the following is an example of structured data?
A. Emails
B. Spreadsheet tables
C. Social media posts
D. Images
Explanation: Structured data is organized in rows and columns.
7. What is a foreign key used for?
A. Encrypting data
B. Creating indexes
C. Linking two tables together
D. Deleting records
Explanation: A foreign key establishes relationships between tables.
8. Which SQL clause is used to filter records?
A. ORDER BY
B. GROUP BY
C. WHERE
D. HAVING
Explanation: WHERE filters records based on conditions.
9. What is metadata?
A. Encrypted data
B. Data about data
C. Deleted records
D. Raw unprocessed data
Explanation: Metadata describes characteristics of data.
,10. Which of the following is a NoSQL database type?
A. MySQL
B. Oracle
C. MongoDB
D. SQL Server
Explanation: MongoDB is a document-based NoSQL database.
11. What is data warehousing primarily used for?
A. Real-time transactions
B. Analytical reporting and historical data storage
C. Software development
D. Hardware configuration
Explanation: Data warehouses store large volumes of historical data.
12. What does ACID stand for in databases?
A. Automation, Consistency, Integrity, Data
B. Atomicity, Consistency, Isolation, Durability
C. Accuracy, Control, Information, Database
D. Access, Control, Input, Design
Explanation: ACID ensures reliable transaction processing.
13. Which normal form eliminates partial dependency?
A. First Normal Form
B. Second Normal Form
C. Third Normal Form
D. Fourth Normal Form
Explanation: 2NF removes partial dependency on a composite key.
14. What is an index in a database?
A. A backup system
B. A security feature
C. A structure that improves query speed
D. A type of table
Explanation: Indexes speed up data retrieval operations.
, 15. Which of the following is a data type?
A. SELECT
B. TABLE
C. INTEGER
D. QUERY
Explanation: INTEGER is a numeric data type.
16. What is a transaction in DBMS?
A. A deleted record
B. A logical unit of work performed on the database
C. A data backup
D. A software installation
Explanation: Transactions represent complete operations in a DBMS.
17. Which command is used to add new data to a table?
A. UPDATE
B. INSERT
C. SELECT
D. ALTER
Explanation: INSERT adds new records to a table.
18. What is referential integrity?
A. Data encryption standard
B. Ensuring relationships between tables remain consistent
C. Data compression technique
D. File storage method
Explanation: It ensures valid relationships between tables.
19. What is a schema in a database?
A. A type of query
B. The structure or blueprint of a database
C. A backup file
D. A data record
Explanation: Schema defines database structure.
Test Newest Update 2026 | Most Asked 250 Questions
And Verified Answers | A+ Success Kit”
1. What is the primary purpose of a database management system (DBMS)?
A. To create operating systems
B. To store, manage, and retrieve data efficiently
C. To design hardware components
D. To compile programming languages
Explanation: A DBMS is designed to handle structured data storage, retrieval, and
management.
2. Which of the following best describes data integrity?
A. Speed of data processing
B. Accuracy and consistency of stored data
C. Data encryption method
D. File compression technique
Explanation: Data integrity ensures that data remains accurate and reliable over its
lifecycle.
3. What is a primary key in a database table?
A. A field that allows duplicate values
B. A temporary data identifier
C. A unique identifier for each record
D. A foreign reference key
Explanation: A primary key uniquely identifies each record in a table.
4. Which SQL command is used to retrieve data from a database?
A. INSERT
B. UPDATE
C. SELECT
D. DELETE
Explanation: SELECT is used to query and retrieve data.
,5. What does normalization in databases aim to achieve?
A. Increase redundancy
B. Encrypt data
C. Reduce data redundancy and improve integrity
D. Delete unnecessary tables
Explanation: Normalization organizes data efficiently to reduce duplication.
6. Which of the following is an example of structured data?
A. Emails
B. Spreadsheet tables
C. Social media posts
D. Images
Explanation: Structured data is organized in rows and columns.
7. What is a foreign key used for?
A. Encrypting data
B. Creating indexes
C. Linking two tables together
D. Deleting records
Explanation: A foreign key establishes relationships between tables.
8. Which SQL clause is used to filter records?
A. ORDER BY
B. GROUP BY
C. WHERE
D. HAVING
Explanation: WHERE filters records based on conditions.
9. What is metadata?
A. Encrypted data
B. Data about data
C. Deleted records
D. Raw unprocessed data
Explanation: Metadata describes characteristics of data.
,10. Which of the following is a NoSQL database type?
A. MySQL
B. Oracle
C. MongoDB
D. SQL Server
Explanation: MongoDB is a document-based NoSQL database.
11. What is data warehousing primarily used for?
A. Real-time transactions
B. Analytical reporting and historical data storage
C. Software development
D. Hardware configuration
Explanation: Data warehouses store large volumes of historical data.
12. What does ACID stand for in databases?
A. Automation, Consistency, Integrity, Data
B. Atomicity, Consistency, Isolation, Durability
C. Accuracy, Control, Information, Database
D. Access, Control, Input, Design
Explanation: ACID ensures reliable transaction processing.
13. Which normal form eliminates partial dependency?
A. First Normal Form
B. Second Normal Form
C. Third Normal Form
D. Fourth Normal Form
Explanation: 2NF removes partial dependency on a composite key.
14. What is an index in a database?
A. A backup system
B. A security feature
C. A structure that improves query speed
D. A type of table
Explanation: Indexes speed up data retrieval operations.
, 15. Which of the following is a data type?
A. SELECT
B. TABLE
C. INTEGER
D. QUERY
Explanation: INTEGER is a numeric data type.
16. What is a transaction in DBMS?
A. A deleted record
B. A logical unit of work performed on the database
C. A data backup
D. A software installation
Explanation: Transactions represent complete operations in a DBMS.
17. Which command is used to add new data to a table?
A. UPDATE
B. INSERT
C. SELECT
D. ALTER
Explanation: INSERT adds new records to a table.
18. What is referential integrity?
A. Data encryption standard
B. Ensuring relationships between tables remain consistent
C. Data compression technique
D. File storage method
Explanation: It ensures valid relationships between tables.
19. What is a schema in a database?
A. A type of query
B. The structure or blueprint of a database
C. A backup file
D. A data record
Explanation: Schema defines database structure.
