WGU D426: OBJECTIVE ASSESSMENT EXAM QUESTIONS AND CORRECT ANSWERS
WITH RATIONALES
Exam coverage
• relational model
• keys and constraints
• normalization
• ER modeling
• SQL retrieval
• data manipulation
• joins
• aggregation
• indexes
• transactions
This PDF contains original exam-style study material and is not a reproduction of confidential
or leaked examination questions.
,1. Which statement best applies the concept of primary key when evaluating a new case
requiring careful interpretation before an intervention is selected? The emphasis is on
recognizing the defining mechanism rather than choosing a superficially related option. The
learner should select the answer that best fits the specific concept being tested.
A. a broad action or description that does not establish the defining feature of primary key
B. column or set of columns that uniquely identifies each row
C. an unrelated process that may occur in a different part of the same general subject
D. a superficially similar finding that does not define primary key
Correct answer: D
Rationale: Correct answer: D. The concept tested is primary key. In this version, the case
centers on a new case requiring careful interpretation before an intervention is selected. The
correct choice states that column or set of columns that uniquely identifies each row. That
definition directly explains why the tested concept fits the scenario. The remaining choices
are less appropriate because they describe related, broader, or different ideas rather than
the defining feature of primary key. Recognizing this distinction supports accurate
interpretation and prevents the common error of selecting an answer merely because it
sounds generally relevant.
2. Which statement best applies the concept of foreign key when evaluating a new case
requiring careful interpretation before an intervention is selected? The emphasis is on
recognizing the defining mechanism rather than choosing a superficially related option. The
,learner should select the answer that best fits the specific concept being tested.
A. column or set of columns referencing a key in another table
B. an unrelated process that may occur in a different part of the same general subject
C. a superficially similar finding that does not define foreign key
D. a broad action or description that does not establish the defining feature of foreign key
Correct answer: A
Rationale: Correct answer: A. The concept tested is foreign key. In this version, the case
centers on a new case requiring careful interpretation before an intervention is selected. The
correct choice states that column or set of columns referencing a key in another table. That
definition directly explains why the tested concept fits the scenario. The remaining choices
are less appropriate because they describe related, broader, or different ideas rather than
the defining feature of foreign key. Recognizing this distinction supports accurate
interpretation and prevents the common error of selecting an answer merely because it
sounds generally relevant.
3. Which statement best applies the concept of normalization when evaluating a new case
requiring careful interpretation before an intervention is selected? The emphasis is on
recognizing the defining mechanism rather than choosing a superficially related option. The
learner should select the answer that best fits the specific concept being tested.
A. a broad action or description that does not establish the defining feature of normalization
B. organizing relational data to reduce redundancy and update anomalies
, C. an unrelated process that may occur in a different part of the same general subject
D. a superficially similar finding that does not define normalization
Correct answer: D
Rationale: Correct answer: D. The concept tested is normalization. In this version, the case
centers on a new case requiring careful interpretation before an intervention is selected. The
correct choice states that organizing relational data to reduce redundancy and update
anomalies. That definition directly explains why the tested concept fits the scenario. The
remaining choices are less appropriate because they describe related, broader, or different
ideas rather than the defining feature of normalization. Recognizing this distinction supports
accurate interpretation and prevents the common error of selecting an answer merely
because it sounds generally relevant.
4. Which statement best applies the concept of first normal form when evaluating a new case
requiring careful interpretation before an intervention is selected? The emphasis is on
recognizing the defining mechanism rather than choosing a superficially related option. The
learner should select the answer that best fits the specific concept being tested.
A. atomic values with repeating groups eliminated
B. an unrelated process that may occur in a different part of the same general subject
C. a superficially similar finding that does not define first normal form
D. a broad action or description that does not establish the defining feature of first normal
form
WITH RATIONALES
Exam coverage
• relational model
• keys and constraints
• normalization
• ER modeling
• SQL retrieval
• data manipulation
• joins
• aggregation
• indexes
• transactions
This PDF contains original exam-style study material and is not a reproduction of confidential
or leaked examination questions.
,1. Which statement best applies the concept of primary key when evaluating a new case
requiring careful interpretation before an intervention is selected? The emphasis is on
recognizing the defining mechanism rather than choosing a superficially related option. The
learner should select the answer that best fits the specific concept being tested.
A. a broad action or description that does not establish the defining feature of primary key
B. column or set of columns that uniquely identifies each row
C. an unrelated process that may occur in a different part of the same general subject
D. a superficially similar finding that does not define primary key
Correct answer: D
Rationale: Correct answer: D. The concept tested is primary key. In this version, the case
centers on a new case requiring careful interpretation before an intervention is selected. The
correct choice states that column or set of columns that uniquely identifies each row. That
definition directly explains why the tested concept fits the scenario. The remaining choices
are less appropriate because they describe related, broader, or different ideas rather than
the defining feature of primary key. Recognizing this distinction supports accurate
interpretation and prevents the common error of selecting an answer merely because it
sounds generally relevant.
2. Which statement best applies the concept of foreign key when evaluating a new case
requiring careful interpretation before an intervention is selected? The emphasis is on
recognizing the defining mechanism rather than choosing a superficially related option. The
,learner should select the answer that best fits the specific concept being tested.
A. column or set of columns referencing a key in another table
B. an unrelated process that may occur in a different part of the same general subject
C. a superficially similar finding that does not define foreign key
D. a broad action or description that does not establish the defining feature of foreign key
Correct answer: A
Rationale: Correct answer: A. The concept tested is foreign key. In this version, the case
centers on a new case requiring careful interpretation before an intervention is selected. The
correct choice states that column or set of columns referencing a key in another table. That
definition directly explains why the tested concept fits the scenario. The remaining choices
are less appropriate because they describe related, broader, or different ideas rather than
the defining feature of foreign key. Recognizing this distinction supports accurate
interpretation and prevents the common error of selecting an answer merely because it
sounds generally relevant.
3. Which statement best applies the concept of normalization when evaluating a new case
requiring careful interpretation before an intervention is selected? The emphasis is on
recognizing the defining mechanism rather than choosing a superficially related option. The
learner should select the answer that best fits the specific concept being tested.
A. a broad action or description that does not establish the defining feature of normalization
B. organizing relational data to reduce redundancy and update anomalies
, C. an unrelated process that may occur in a different part of the same general subject
D. a superficially similar finding that does not define normalization
Correct answer: D
Rationale: Correct answer: D. The concept tested is normalization. In this version, the case
centers on a new case requiring careful interpretation before an intervention is selected. The
correct choice states that organizing relational data to reduce redundancy and update
anomalies. That definition directly explains why the tested concept fits the scenario. The
remaining choices are less appropriate because they describe related, broader, or different
ideas rather than the defining feature of normalization. Recognizing this distinction supports
accurate interpretation and prevents the common error of selecting an answer merely
because it sounds generally relevant.
4. Which statement best applies the concept of first normal form when evaluating a new case
requiring careful interpretation before an intervention is selected? The emphasis is on
recognizing the defining mechanism rather than choosing a superficially related option. The
learner should select the answer that best fits the specific concept being tested.
A. atomic values with repeating groups eliminated
B. an unrelated process that may occur in a different part of the same general subject
C. a superficially similar finding that does not define first normal form
D. a broad action or description that does not establish the defining feature of first normal
form
