DATA-MANAGEMENT-FOUNDATIONS PASS-FOR-SURE BRAINDUMPS: WGU DATA MANAGEMENT–FOUNDATIONS EXAM & DATA-MANAGEMENT-FOUNDATIONS QUIZ GUIDE

Data-Management-Foundations Pass-For-Sure Braindumps: WGU Data Management–Foundations Exam & Data-Management-Foundations Quiz Guide

Data-Management-Foundations Pass-For-Sure Braindumps: WGU Data Management–Foundations Exam & Data-Management-Foundations Quiz Guide

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No doubt the WGU Data Management – Foundations Exam (Data-Management-Foundations) certification is one of the most challenging certification exams in the market. This Data-Management-Foundations certification exam gives always a tough time to WGU Data Management – Foundations Exam (Data-Management-Foundations) exam candidates. The ITexamReview understands this hurdle and offers recommended and real Data-Management-Foundations Exam Practice questions in three different formats. These formats hold high demand in the market and offer a great solution for quick and complete WGU Data Management – Foundations Exam (Data-Management-Foundations) exam preparation.

WGU Data Management – Foundations Exam Sample Questions (Q40-Q45):

NEW QUESTION # 40
Which operation finds an entry containing a search value by repeatedly splitting the index in two?

  • A. Binary search
  • B. Index scan
  • C. Table scan
  • D. Fan-out

Answer: A

Explanation:
Binary searchis an algorithm that finds a search value byrepeatedly dividing the search space into two halves. It is commonly used inindexed searches.
Example Usage in Databases:
* B-Trees and B+ Trees(used in database indexing) applybinary searchto navigate the index efficiently.
* If searching for ID = 50 in asorted list of IDs, binary search:
* Splits the list into two halves.
* Checks the middle value.
* Eliminates half of the dataset.
* Repeats until the value is found.
Why Other Options Are Incorrect:
* Option A (Table scan) (Incorrect):Readsevery row,much slowerthan binary search.
* Option C (Index scan) (Incorrect):Uses indexes but does not necessarily apply binary search.
* Option D (Fan-out) (Incorrect):Describesbranching in B-Trees, not searching.
Thus, the correct answer isBinary search, as it repeatedlysplits the indexin two.


NEW QUESTION # 41
Which keyword can be used as a clause in an ALTER TABLE statement?

  • A. AGGREGATE
  • B. CHANGE
  • C. DELETE
  • D. STOP

Answer: B

Explanation:
TheALTER TABLEstatement is used to modify an existing database table structure. One common clause is CHANGE, which allows renaming a column and modifying its data type.
Example:
sql
ALTER TABLE Employees CHANGE COLUMN OldName NewName VARCHAR(50);
* Option A (Incorrect):DELETE is used to removerows, not alter table structure.
* Option B (Correct):CHANGE is avalid clausefor renaming and modifying columns in MySQL and some other databases.
* Option C (Incorrect):STOP is not a valid SQL keyword for altering tables.
* Option D (Incorrect):AGGREGATE refers to functions like SUM() and AVG(), not table alterations.


NEW QUESTION # 42
Which function is considered an aggregate function?

  • A. MAX
  • B. TRIM
  • C. DESC
  • D. ABS

Answer: A

Explanation:
Aggregate functionsperform calculationson a set of values and return asingle result.MAX()is one such function, returning thelargest value in a column.
Common Aggregate Functions:
A screenshot of a computer AI-generated content may be incorrect.

Example Usage:
sql
SELECT MAX(Salary) FROM Employees;
* Retrieves thehighest salaryin the Employees table.
Why Other Options Are Incorrect:
* Option B (TRIM) (Incorrect):Removes spaces from strings butis not an aggregate function.
* Option C (ABS) (Incorrect):Returns theabsolute value of a numberbut doesnot aggregate multiple rows.
* Option D (DESC) (Incorrect):Used in ORDER BY forsorting in descending order,not for aggregation.
Thus, the correct answer isMAX(), as it is atrue aggregate function.


NEW QUESTION # 43
What is the first step of the analysis phase for designing a database?

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

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 # 44
What is a common error made while inserting an automatically incrementing primary key?

  • A. Failing to set a numeric value in a newly inserted row
  • B. Designating multiple primary keys
  • C. Inserting a value and overriding auto-increment for a primary key
  • D. Forgetting to specify which is the auto-increment column

Answer: C

Explanation:
In databases, primary keys are oftenset to auto-incrementso that new rows automatically receive unique values. However,one common error is manually inserting a value into an auto-incremented primary key column, whichoverrides the automatic numberingand may cause conflicts.
Example of Auto-Increment Setup:
sql
CREATE TABLE Users (
UserID INT AUTO_INCREMENT PRIMARY KEY,
Username VARCHAR(50)
);
Incorrect Insert (Error-Prone Approach):
sql
INSERT INTO Users (UserID, Username) VALUES (100, 'Alice');
* Thismanually overrides the auto-increment, which can lead toduplicate key errors.
Correct Insert (Avoiding Errors):
sql
INSERT INTO Users (Username) VALUES ('Alice');
* Thedatabase assigns UserID automatically, preventing conflicts.
Why Other Options Are Incorrect:
* Option B (Failing to set a numeric value) (Incorrect):The databaseautomatically assignsvalues when AUTO_INCREMENT is used.
* Option C (Designating multiple primary keys) (Incorrect):Whileincorrect, most databases will prevent this at creation time.
* Option D (Forgetting to specify which is the auto-increment column) (Incorrect):If AUTO_INCREMENT is set, the database handles numbering automatically.
Thus, the most common error isInserting a value and overriding auto-increment, which can cause duplicate key errors and data inconsistencies.


NEW QUESTION # 45
......

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