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Data-Management-Foundations Valid Dumps Sheet, Data-Management-Foundations Test Answers

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WGU Data Management – Foundations Exam Sample Questions (Q16-Q21):

NEW QUESTION # 16
Which clause or statement in a CREATE statement ensures a certain range of data?

A. FROM
B. CHECK
C. SET
D. WHERE

Answer: B

Explanation:
TheCHECKconstraint is used in SQL toenforce ruleson a column's values. It ensures that data inserted into a table meets specified conditions, such as range restrictions or logical rules.
Example Usage:
sql
CREATE TABLE Employees (
ID INT PRIMARY KEY,
Name VARCHAR(50),
Salary INT CHECK (Salary BETWEEN 30000 AND 150000)
);
* This constraint ensures thatsalary values fall between 30,000 and 150,000.
* If an INSERT or UPDATE statement tries to set Salary = 20000, itfailsbecause it does notmeet the CHECK condition.
Why Other Options Are Incorrect:
* Option B (FROM) (Incorrect):Used in SELECT statements, not for constraints.
* Option C (WHERE) (Incorrect):Filters rows in queries butdoes not enforce constraints.
* Option D (SET) (Incorrect):Used for updating records (UPDATE table_name SET column = value) butnot for defining constraints.
Thus,CHECK is the correct answer, as it ensures that column values remain within an expected range.

NEW QUESTION # 17
What is the first step of the analysis phase for designing a database?

A. Implement attributes
B. Determine cardinality
C. Identify entities
D. Draw an entity-relationship (ER) diagram

Answer: C

Explanation:
Thefirst stepin database analysis isidentifying entities, which are thereal-world objectsthat need to be represented in the database.
Example Usage:
* In a school system, the mainentitiescould be:
Students, Courses, Instructors
Why Other Options Are Incorrect:
* Option A (Determine cardinality) (Incorrect):Determining relationships comesafteridentifying entities.
* Option C (Draw an ER diagram) (Incorrect):ER diagramsvisualizeentities but arenot the first step.
* Option D (Implement attributes) (Incorrect):Attributes aredefined afterentities are identified.
Thus, the correct answer isIdentify entities, asentities form the foundation of the databasemodel.

NEW QUESTION # 18
Which constraint propagates primary key changes to foreign keys?

A. CASCADE
B. RESTRICT
C. SET DEFAULT
D. SET NULL

Answer: A

Explanation:
TheCASCADEconstraint ensures thatupdates or deletions in the primary key table automatically reflect in the foreign key table.
Example Usage:
sql
CREATE TABLE Departments (
DeptID INT PRIMARY KEY,
DeptName VARCHAR(50)
);
CREATE TABLE Employees (
EmpID INT PRIMARY KEY,
Name VARCHAR(50),
DeptID INT,
FOREIGN KEY (DeptID) REFERENCES Departments(DeptID) ON UPDATE CASCADE ON DELETE CASCADE );
* If DeptIDchangesin Departments, itautomatically updatesin Employees.
* If a DeptID isdeleted, all employees in that departmentare also deleted.
Why Other Options Are Incorrect:
* Option A (SET DEFAULT) (Incorrect):Sets foreign key values to adefaultvalue, rather than propagating changes.
* Option B (SET NULL) (Incorrect):When the referenced key is deleted, dependent records areset to NULLinstead of being updated/deleted.
* Option C (RESTRICT) (Incorrect):Prevents deletion of a referenced row if dependent foreign key rows exist.
Thus, the correct answer isCASCADE, as itpropagates primary key changes to dependent foreign keys.

NEW QUESTION # 19
Which term refers to a path from a top-level block to a bottom-level block?

A. Sparse index
B. Fan-out
C. Branch
D. Crow's foot

Answer: C

Explanation:
In database indexing, abranchrefers to thepath from the top-level block (root node) to a bottom-level block (leaf node)in aB-Tree or B+ Tree index structure.
Example Usage in Indexing:
* AB-Tree indexorganizes data hierarchically, withbranches leading to different parts of the tree.
* When searching for a record, thequery follows a branchfrom theroot node down to the correct leaf node.
Why Other Options Are Incorrect:
* Option A (Fan-out) (Incorrect):Refers tohow many children a node has, not the path.
* Option B (Crow's foot) (Incorrect):Anotation used in ER diagrams, not indexing.
* Option D (Sparse index) (Incorrect):A type of indexstoring only some entries, not the path itself.
Thus, the correct answer isBranch, as it defines thepath from top to bottom in a database index.

NEW QUESTION # 20
Which statement is associated with two separate entities?

A. Entity type
B. Relationship
C. Reflexive relationship
D. Attribute

Answer: B

Explanation:
Arelationshipin an ER model defineshow two separate entities interact.
Example Usage:
A screenshot of a computer AI-generated content may be incorrect.

CREATE TABLE Customers (
CustomerID INT PRIMARY KEY,
Name VARCHAR(50)
);
CREATE TABLE Orders (
OrderID INT PRIMARY KEY,
CustomerID INT,
FOREIGN KEY (CustomerID) REFERENCES Customers(CustomerID)
);
* Customers and Orders are separate entities, related via CustomerID.
Why Other Options Are Incorrect:
* Option A (Reflexive relationship) (Incorrect):Used forself-referencing entities, not two different entities.
* Option B (Entity type) (Incorrect):Defines aclass of objects, but does not establish relationships.
* Option D (Attribute) (Incorrect):Attributesdescribeentities but do not connect them.
Thus, the correct answer isRelationship, as it connectstwo separate entities.

NEW QUESTION # 21
......

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Greg King Greg King

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