WGU D426: OBJECTIVE ASSESSMENT EXAM LATEST 2026/2027
WITH ACTUAL QUESTIONS AND CORRECT VERIFIED ANSWERS
ALREADY GRADED A+ 100% GUARANTEED PASS!
SECTION 1: DATABASE CONCEPTS & ARCHITECTURE
(Questions 1-25)
Question 1
Which design type specifies database requirements without regard to a specific
database system?
A. Physical design
B. Conceptual design
C. Logical design
D. Abstract design
Correct Answer: B
Rationale: Conceptual design specifies database requirements at a high level without
regard to a specific database system (DBMS). It focuses on what data the system will
contain and how data elements relate, independent of implementation . Logical design
converts the conceptual model into tables, columns, and keys—still database-
independent but more structured. Physical design implements the logical design on a
specific DBMS.
Question 2
What characterizes the rules of relational databases?
A. They are logical constraints that ensure the data is valid
B. They are based on business policy and specific databases
C. They represent data volumes and rapidly changing data structures
D. They embody the theoretical foundation of the SQL language
,Correct Answer: A
Rationale: Rules of relational databases are logical constraints that ensure data
validity—such as entity integrity (primary keys are unique and not null), referential
integrity (foreign keys must match existing primary keys or be null), and domain
constraints (values must be from defined domains) . These are not business-policy-
based, not about data volumes, and not the theoretical foundation of SQL—they are the
rules that enforce data quality within the relational model.
Question 3
In a relational database, a 'tuple' refers to:
A. A column in a table
B. A row in a table
C. A database table
D. A type of relationship
Correct Answer: B
Rationale: In relational theory, a tuple is a single row in a relation (table). Attributes are
columns . A relation is a named set of tuples, all drawn from the same sequence of
domains .
Question 4
What is the standardized language of relational database systems?
A. Contextual Query Language
B. Structured Query Language (SQL)
C. Select Query Language
D. Object Query Language
Correct Answer: B
Rationale: SQL (Structured Query Language) is the standardized language for relational
database systems . Its sublanguages include: DDL (Data Definition Language — CREATE,
ALTER, DROP), DML (Data Manipulation Language — INSERT, UPDATE, DELETE), DQL
,(Data Query Language — SELECT), DCL (Data Control Language — GRANT, REVOKE),
and DTL (Data Transaction Language — COMMIT, ROLLBACK).
Question 5
Which SQL command creates a new table?
A. CREATE DATABASE
B. CREATE TABLE
C. CREATE VIEW
D. CREATE INDEX
Correct Answer: B
Rationale: CREATE TABLE is a Data Definition Language (DDL) command used to define
a new table structure in the database . CREATE DATABASE creates a new database,
CREATE VIEW creates a virtual table based on a query, and CREATE INDEX creates an
index on a table.
Question 6
Which of the following is NOT a characteristic of a relational database?
A. Data is organized into tables
B. Data is linked through relationships
C. Data redundancy is minimized
D. Data is stored in a single, large file
Correct Answer: D
Rationale: A relational database organizes data into tables with relationships between
them. Data is not stored in a single, large file—that would describe a file-based system
rather than a relational database .
, Question 7
What is the purpose of a database management system (DBMS)?
A. To create, store, and manage databases
B. To write SQL queries only
C. To ensure data security only
D. To analyze data trends
Correct Answer: A
Rationale: A DBMS creates, stores, and manages databases. It is a collection of
programs that manages a relational database, translating user requests into commands
that physically locate and retrieve requested data .
Question 8
In a database, which component stores the actual data?
A. Query processor
B. Storage manager
C. Database administrator
D. User interface
Correct Answer: B
Rationale: The storage manager handles how data is stored, retrieved, and updated on
disk. It includes the file manager and buffer manager . The query processor interprets
queries; the database administrator manages the database; the user interface allows
interaction.
Question 9
What is a schema in database terminology?
A. The actual data in the database
B. The structure of tables in the database
WITH ACTUAL QUESTIONS AND CORRECT VERIFIED ANSWERS
ALREADY GRADED A+ 100% GUARANTEED PASS!
SECTION 1: DATABASE CONCEPTS & ARCHITECTURE
(Questions 1-25)
Question 1
Which design type specifies database requirements without regard to a specific
database system?
A. Physical design
B. Conceptual design
C. Logical design
D. Abstract design
Correct Answer: B
Rationale: Conceptual design specifies database requirements at a high level without
regard to a specific database system (DBMS). It focuses on what data the system will
contain and how data elements relate, independent of implementation . Logical design
converts the conceptual model into tables, columns, and keys—still database-
independent but more structured. Physical design implements the logical design on a
specific DBMS.
Question 2
What characterizes the rules of relational databases?
A. They are logical constraints that ensure the data is valid
B. They are based on business policy and specific databases
C. They represent data volumes and rapidly changing data structures
D. They embody the theoretical foundation of the SQL language
,Correct Answer: A
Rationale: Rules of relational databases are logical constraints that ensure data
validity—such as entity integrity (primary keys are unique and not null), referential
integrity (foreign keys must match existing primary keys or be null), and domain
constraints (values must be from defined domains) . These are not business-policy-
based, not about data volumes, and not the theoretical foundation of SQL—they are the
rules that enforce data quality within the relational model.
Question 3
In a relational database, a 'tuple' refers to:
A. A column in a table
B. A row in a table
C. A database table
D. A type of relationship
Correct Answer: B
Rationale: In relational theory, a tuple is a single row in a relation (table). Attributes are
columns . A relation is a named set of tuples, all drawn from the same sequence of
domains .
Question 4
What is the standardized language of relational database systems?
A. Contextual Query Language
B. Structured Query Language (SQL)
C. Select Query Language
D. Object Query Language
Correct Answer: B
Rationale: SQL (Structured Query Language) is the standardized language for relational
database systems . Its sublanguages include: DDL (Data Definition Language — CREATE,
ALTER, DROP), DML (Data Manipulation Language — INSERT, UPDATE, DELETE), DQL
,(Data Query Language — SELECT), DCL (Data Control Language — GRANT, REVOKE),
and DTL (Data Transaction Language — COMMIT, ROLLBACK).
Question 5
Which SQL command creates a new table?
A. CREATE DATABASE
B. CREATE TABLE
C. CREATE VIEW
D. CREATE INDEX
Correct Answer: B
Rationale: CREATE TABLE is a Data Definition Language (DDL) command used to define
a new table structure in the database . CREATE DATABASE creates a new database,
CREATE VIEW creates a virtual table based on a query, and CREATE INDEX creates an
index on a table.
Question 6
Which of the following is NOT a characteristic of a relational database?
A. Data is organized into tables
B. Data is linked through relationships
C. Data redundancy is minimized
D. Data is stored in a single, large file
Correct Answer: D
Rationale: A relational database organizes data into tables with relationships between
them. Data is not stored in a single, large file—that would describe a file-based system
rather than a relational database .
, Question 7
What is the purpose of a database management system (DBMS)?
A. To create, store, and manage databases
B. To write SQL queries only
C. To ensure data security only
D. To analyze data trends
Correct Answer: A
Rationale: A DBMS creates, stores, and manages databases. It is a collection of
programs that manages a relational database, translating user requests into commands
that physically locate and retrieve requested data .
Question 8
In a database, which component stores the actual data?
A. Query processor
B. Storage manager
C. Database administrator
D. User interface
Correct Answer: B
Rationale: The storage manager handles how data is stored, retrieved, and updated on
disk. It includes the file manager and buffer manager . The query processor interprets
queries; the database administrator manages the database; the user interface allows
interaction.
Question 9
What is a schema in database terminology?
A. The actual data in the database
B. The structure of tables in the database
