WGU DATA MANAGEMENT–FOUNDATIONS EXAM STUDY MATERIAL & DATA-MANAGEMENT-FOUNDATIONS TORRENT PDF & WGU DATA MANAGEMENT–FOUNDATIONS EXAM TRAINING DUMPS

WGU Data Management–Foundations Exam study material & Data-Management-Foundations torrent pdf & WGU Data Management–Foundations Exam training dumps

WGU Data Management–Foundations Exam study material & Data-Management-Foundations torrent pdf & WGU Data Management–Foundations Exam training dumps

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WGU Data Management – Foundations Exam Sample Questions (Q60-Q65):

NEW QUESTION # 60
Which object relates an entity to itself in an entity-relationship model?

  • A. Reflexive relationship
  • B. Repository
  • C. Relationship instance
  • D. Attribute

Answer: A

Explanation:
Areflexive relationship(also called aunary relationship) occurs when anentity is related to itself.
Example Usage:
A screenshot of a computer AI-generated content may be incorrect.

CREATE TABLE Employees (
EmpID INT PRIMARY KEY,
Name VARCHAR(50),
ManagerID INT,
FOREIGN KEY (ManagerID) REFERENCES Employees(EmpID)
);
* ManagerIDrefers to another employeewithin the same table.
Why Other Options Are Incorrect:
* Option A (Repository) (Incorrect):A data storage structure, not a relationship type.
* Option B (Relationship instance) (Incorrect):Describesa specific connection between entities, not a reflexive relationship.
* Option D (Attribute) (Incorrect):Attributes storecharacteristics, butdo not define relationships.
Thus, the correct answer isReflexive relationship, as it relates an entity to itself.


NEW QUESTION # 61
Where does a primary key traditionally appear in a table?

  • A. In the last visible column
  • B. In the top row
  • C. In the table header
  • 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 # 62
Which constraint propagates primary key changes to foreign keys?

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

Answer: B

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 # 63
Which clause from a SELECT statement immediately accompanies the SELECT clause in MySQL?

  • A. FROM
  • B. TABLE
  • C. VALUE
  • D. WHERE

Answer: A

Explanation:
InSQL syntax, the FROM clause is the first clause that follows SELECT. It specifies the table(s) from which the data will be retrieved.
Example:
sql
SELECT name, salary FROM Employees;
* Option A (Correct):The FROM clauseimmediately followsthe SELECT clause in MySQL.
* Option B (Incorrect):VALUE is not a valid clause in MySQL SELECT statements.
* Option C (Incorrect):WHERE is used to filter recordsafter specifying the table in FROM.
* Option D (Incorrect):TABLE is not a valid clause following SELECT in SQL.


NEW QUESTION # 64
What is the role of the transaction manager within the database system architecture?

  • A. The transaction manager logs insert, update, and delete queries, and the result is sent back to the application.
  • B. The transaction manager translates the query processor instructions into filesystem commands and uses an index to quickly locate the requested data.
  • C. The transaction manager is composed of a query processor, storage manager, transaction manager, log, and catalog.
  • D. The transaction manager uses information from the catalog to perform query optimization.

Answer: A


NEW QUESTION # 65
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