WGU D427 DATABASE MANAGEMENT
APPLICATIONS PRACTICE
EXAMINATION 2026 QUESTIONS WITH
ANSWERS GUARANTEED TO PASS.
▶ What does CRUD stand for in the context of database operations?
Answer: Create, Read, Update, Delete
▶ What is an entity in an ER model? Answer: A person, place,
product, concept, or activity
▶ What does a unique attribute signify in ER modeling? Answer:
An attribute that identifies each entity instance uniquely
▶ What is a composite attribute? Answer: An attribute that can be
divided into smaller parts, each representing a more basic attribute
▶ Which of the following best represents a ternary relationship?
Answer: A relationship involving three different entity types
▶ Which operation combines rows from two tables based on related
columns? Answer: JOIN
, ▶ What characterizes a table cluster? Answer: Interleaves rows of
two or more tables in the same storage area.
▶ Who introduced the relational model? Answer: E.F. Codd
▶ What is the term for a row in a relational database? Answer:
Tuple
▶ _______________ ensures the consistency and validity of
relationships between tables. It dictates that foreign key values in one
table must either be null or match primary key values in another table
(or the same table in the case of self-referencing relationships).
Answer: Referential integrity
▶ In SQL, which command is used to add a row of new data into a
table? Answer: INSERT INTO
▶ To convert a string to lower case in SQL, which function is used?
Answer: LOWER()
▶ What describes the 'heap table' structure's approach to managing
free space after row deletion? Answer: Tracks free space as a linked
list for future inserts
▶ What is the purpose of an ER Diagram? Answer: To visually
represent the data model of a system
APPLICATIONS PRACTICE
EXAMINATION 2026 QUESTIONS WITH
ANSWERS GUARANTEED TO PASS.
▶ What does CRUD stand for in the context of database operations?
Answer: Create, Read, Update, Delete
▶ What is an entity in an ER model? Answer: A person, place,
product, concept, or activity
▶ What does a unique attribute signify in ER modeling? Answer:
An attribute that identifies each entity instance uniquely
▶ What is a composite attribute? Answer: An attribute that can be
divided into smaller parts, each representing a more basic attribute
▶ Which of the following best represents a ternary relationship?
Answer: A relationship involving three different entity types
▶ Which operation combines rows from two tables based on related
columns? Answer: JOIN
, ▶ What characterizes a table cluster? Answer: Interleaves rows of
two or more tables in the same storage area.
▶ Who introduced the relational model? Answer: E.F. Codd
▶ What is the term for a row in a relational database? Answer:
Tuple
▶ _______________ ensures the consistency and validity of
relationships between tables. It dictates that foreign key values in one
table must either be null or match primary key values in another table
(or the same table in the case of self-referencing relationships).
Answer: Referential integrity
▶ In SQL, which command is used to add a row of new data into a
table? Answer: INSERT INTO
▶ To convert a string to lower case in SQL, which function is used?
Answer: LOWER()
▶ What describes the 'heap table' structure's approach to managing
free space after row deletion? Answer: Tracks free space as a linked
list for future inserts
▶ What is the purpose of an ER Diagram? Answer: To visually
represent the data model of a system
