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WGU Data Management – Foundations Exam Sample Questions (Q41-Q46):

NEW QUESTION # 41
What is the first step of the analysis phase for designing a database?

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

Answer: D

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 # 42
Which clause is used to specify the join columns when performing a join in MySQL?

A. AS
B. ON
C. AND
D. JOIN

Answer: B

Explanation:
When performing aJOIN operationin MySQL, the ON clause specifies thejoining condition, defining which columns from both tables should be matched.
Example:
sql
SELECT Employees.Name, Departments.DepartmentName
FROM Employees
JOIN Departments ON Employees.DepartmentID = Departments.ID;
* Option A (Incorrect):AS is used foraliasing tables and columns, not for specifying join conditions.
* Option B (Incorrect):JOIN defines the type of join (INNER JOIN, LEFT JOIN, etc.), butdoes not specify the columns.
* Option C (Correct):The ON clause is used tospecify the join conditionbetween two tables.
* Option D (Incorrect):AND is used in filtering conditions, not for joining tables.

NEW QUESTION # 43
Where does a primary key traditionally appear in a table?

A. In the last visible column
B. In the table header
C. In the top row
D. In the first column

Answer: D

Explanation:
Bydatabase design conventions, theprimary key is usually placed in the first columnof a table to make it easy to identify and reference.
Example Usage:
sql
CREATE TABLE Employees (
EmpID INT PRIMARY KEY, -- First column (convention)
Name VARCHAR(50),
Salary DECIMAL(10,2)
);
* EmpID is placed as the first columnfor clarity and quick access.
Why Other Options Are Incorrect:
* Option A (In the table header) (Incorrect):Table headers onlydisplay column names, they do not contain values.
* Option C (In the top row) (Incorrect):Thetop row contains data, not theprimary key definition.
* Option D (In the last visible column) (Incorrect):While technically possible,placing a primary key at the endisuncommonin database design.
Thus, the correct answer isIn the first column, as this is the standard convention in relational databases.

NEW QUESTION # 44
Which term defines a column, or group of columns, that refers to a primary key in a different table?

A. Composite key
B. Super key
C. Foreign key
D. Simple key

Answer: C

Explanation:
Aforeign keyis a column (or a set of columns) that establishes arelationship between two tablesby referencing theprimary key of another 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)
);
* DeptID in Employees is a foreign key, referencing DeptID in Departments.
* Ensuresreferential integrity# DeptID in Employeesmust existin Departments.
Why Other Options Are Incorrect:
* Option A (Super key) (Incorrect):Asuper keyis any set of columns that uniquely identifies a row, but itdoes not reference another table.
* Option B (Simple key) (Incorrect):Asimple keyis asingle-column primary key, not a reference to another table.
* Option C (Composite key) (Incorrect):Acomposite keyconsists ofmultiple columnsbut does not necessarily reference another table.
Thus, the correct answer isForeign key, as it establishes aconnection between two tables.

NEW QUESTION # 45
Which statement is associated with two separate entities?

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

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 # 46
......

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