Data-Management-Foundations Latest Guide Files & Mock Data-Management-Foundations Exam

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WGU Data Management – Foundations Exam Sample Questions (Q29-Q34):

NEW QUESTION # 29
How is the primary key indicated in a table?

A. By using an SQL keyword
B. By using a formula in SQL
C. By using a diamond symbol inserted into the table
D. By using bold typeface in the appropriate column

Answer: A

Explanation:
In SQL, aprimary key is explicitly defined using the PRIMARY KEY keywordwhen creating a table.
Example Usage:
sql
CREATE TABLE Products (
ProductID INT PRIMARY KEY,
Name VARCHAR(100),
Price DECIMAL(10,2)
);
* Here,PRIMARY KEY is the SQL keyword that designates ProductID as the primary key.
Why Other Options Are Incorrect:
* Option A (Formula in SQL) (Incorrect):SQLdoes not use formulas to define primary keys.
* Option C (Bold typeface) (Incorrect):SQL syntax does not rely on text formatting.
* Option D (Diamond symbol) (Incorrect):ER diagramsmight use symbols, but SQLdoes not use diamonds to indicate keys.
Thus, the correct answer isSQL keyword, as primary keys are explicitly defined using PRIMARY KEY.

NEW QUESTION # 30
What is the role of a query processor in the database system architecture?

A. It sends results back to the application that requested the queries.
B. It translates instructions into file system commands.
C. It uses information from the catalog to perform query optimization.
D. It writes log records before applying changes to the database.

Answer: C

Explanation:
Aquery processoris responsible forquery optimization and executionin a database management system (DBMS). It analyzes SQL statements, optimizes execution plans, and ensures efficient retrieval of data.
* Option A (Correct):Thequery processoroptimizes queries by analyzing metadata from thesystem catalogto determine the best execution strategy.
* Option B (Incorrect):Logging transactionsbefore applying changes is the responsibility of the transaction manager.
* Option C (Incorrect):Translating instructions intofile system commandsis handled by thestorage manager, not the query processor.
* Option D (Incorrect):While the query processor helps retrieve results, thedatabaseengineandAPI layerare responsible for returning results to applications.

NEW QUESTION # 31
Which expression can be used to create a temporary name for a table?

A. NEW
B. HAVING
C. ALIAS
D. UNION

Answer: C

Explanation:
Analiasis used in SQL to give atemporaryname to a table or column within a query. It makes queries more readable and helps in cases where a table needs to be referenced multiple times (e.g., in aself-join).
Example Usage:
sql
SELECT e.Name, d.DepartmentName
FROM Employees AS e
JOIN Departments AS d
ON e.DeptID = d.ID;
* Here,Employees is aliased as eandDepartments as d, making the query shorter and clearer.
Why Other Options Are Incorrect:
* Option A (HAVING) (Incorrect):Used to filter grouped results, not create aliases.
* Option B (NEW) (Incorrect):Not a valid SQL keyword for aliasing.
* Option D (UNION) (Incorrect):Combines result sets but does not rename tables.
Thus, the correct answer isALIAS, which allows fortemporary naming of tables or columns.

NEW QUESTION # 32
Which relationship exists between occurrences of the same entity types?

A. Cardinality
B. Binary
C. Unary
D. Modality

Answer: C

Explanation:
Aunary relationship(also known as arecursive relationship) occurs when an entityrelates to itself.
Example Usage:
* Employees and Managers:
sql
CREATE TABLE Employees (
EmpID INT PRIMARY KEY,
Name VARCHAR(50),
ManagerID INT,
FOREIGN KEY (ManagerID) REFERENCES Employees(EmpID)
);
* Here, ManagerIDreferences another Employee# aunary (self-referential) relationship.
Why Other Options Are Incorrect:
* Option A (Modality) (Incorrect):Describesoptional vs. mandatoryrelationships, not self-referencing.
* Option C (Cardinality) (Incorrect):Defines how many instances relate,not the type of relationship.
* Option D (Binary) (Incorrect):Binary relationships involvetwo different entities, not self-referencing.
Thus, the correct answer isUnary, as it describesrelationships within the same entity type.

NEW QUESTION # 33
Which SELECT statement uses valid syntax for SQL?

A. SELECT "column name", "column name" FROM "table name" WHERE "column name"
B. SELECT column1, column2 FROM table_name;
C. SELECT column1, column2 WHERE condition FROM table_name;
D. SELECT ALL column1, column2 FROM table_name;

Answer: B

Explanation:
Avalid SELECT statementin SQL follows this basic syntax:
sql
SELECT column1, column2
FROM table_name
WHERE condition;
The correct optionDfollows this syntaxcorrectly.
Why Other Options Are Incorrect:
* Option A (Incorrect):SQL does not usedouble quotes(") around column/table names unless explicitly required in some databases.
* Option B (Incorrect):The WHERE clausemust appear after the FROM clause.
* Option C (Incorrect):ALL isnota valid keyword in standard SQL queries.
Thus,Option Dfollows the correct SQL syntax.

NEW QUESTION # 34
......

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Data-Management-Foundations Latest Guide Files & Mock Data-Management-Foundations Exam

New Data-Management-Foundations Latest Guide Files | Pass-Sure WGU Mock Data-Management-Foundations Exam: WGU Data Management – Foundations Exam

WGU Data Management – Foundations Exam Sample Questions (Q29-Q34):

Free PDF Quiz WGU - Data-Management-Foundations - Accurate WGU Data Management – Foundations Exam Latest Guide Files