WGU DATA-MANAGEMENT-FOUNDATIONS VALUABLE FEEDBACK | DATA-MANAGEMENT-FOUNDATIONS TEST SCORE REPORT

WGU Data-Management-Foundations Valuable Feedback | Data-Management-Foundations Test Score Report

WGU Data-Management-Foundations Valuable Feedback | Data-Management-Foundations Test Score Report

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WGU Data Management – Foundations Exam Sample Questions (Q35-Q40):

NEW QUESTION # 35
What is the second step in the implement relationships stage of database design?

  • A. Implement one-one relationships
  • B. Implement subtype entities
  • C. Implement weak entities
  • D. Specify cascade

Answer: A

Explanation:
Thesecond step in implementing relationshipsis definingone-to-one (1:1) relationshipsbetween entities.
Example Usage:
* Example of a 1:1 relationship:
sql
CREATE TABLE Employees (
EmpID INT PRIMARY KEY,
Name VARCHAR(50)
);
CREATE TABLE EmployeeDetails (
EmpID INT PRIMARY KEY,
Address VARCHAR(255),
FOREIGN KEY (EmpID) REFERENCES Employees(EmpID)
);
* Here, eachemployee has exactly one detail record, creating a1:1 relationship.
Why Other Options Are Incorrect:
* Option A (Implement weak entities) (Incorrect):Weak entities rely on aforeign keyand are implementedlater.
* Option C (Implement subtype entities) (Incorrect):Subtypes arespecial casesandnot implemented in the second step.
* Option D (Specify cascade) (Incorrect):Cascade rules (ON DELETE, ON UPDATE)are defined duringforeign key implementation, not in the second step.
Thus, the correct answer isImplement one-one relationships, as it is thenext logical stepafter defining entities.


NEW QUESTION # 36
Which function removes only the leading spaces from a string?

  • A. LEFT
  • B. TRIM
  • C. REPLACE
  • D. LTRIM

Answer: D

Explanation:
TheLTRIM()function in SQL removesleading spaces(spaces at the beginning of a string) while keeping spaces at the end.
Example Usage:
sql
SELECT LTRIM(' Hello World') AS TrimmedText;
Output:
bash
'Hello World'
Why Other Options Are Incorrect:
* Option B (LEFT) (Incorrect):Used for extracting a portion of a string. Example:
sql
SELECT LEFT('Hello World', 5); -- Output: 'Hello'
* Option C (TRIM) (Incorrect):Removesboth leading and trailing spaces, not just leading ones.
Example:
sql
SELECT TRIM(' Hello World '); -- Output: 'Hello World'
* Option D (REPLACE) (Incorrect):Replaces occurrences of one substring with another but doesnot specifically remove spaces.
Thus, the correct answer isLTRIM(), which removes onlyleading spaces.


NEW QUESTION # 37
Which clause or statement in a CREATE statement ensures a certain range of data?

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

Answer: A

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 # 38
Which keyword is used to introduce a limiter in a SELECT statement?

  • A. INTO
  • B. WHERE
  • C. DROP
  • D. FROM

Answer: B

Explanation:
TheWHEREclause is used inSQL SELECT statementstolimitthe number of rows that match a specific condition. It helps filter data based on given criteria before retrieving the results.
Example Usage:
sql
SELECT *
FROM Employees
WHERE Salary > 50000;
* This querylimitsthe result set to employees whose salary isgreater than 50,000.
Why Other Options Are Incorrect:
* Option A (FROM) (Incorrect):Specifies the table from which data is retrieved butdoes not limit results.
* Option B (DROP) (Incorrect):Used fordeleting tables, databases, or views, not filtering rows.
* Option C (INTO) (Incorrect):Used in statements like INSERT INTO or SELECT INTO, whichdo not filter results.
Thus,WHERE is the correct keywordfor applying alimiter in a SELECT statement.


NEW QUESTION # 39
Which property of an entity can become a column in a table?

  • A. Uniqueness
  • B. Non-null values
  • C. Modality
  • D. Attribute

Answer: D

Explanation:
Indatabase design,attributesof an entity becomecolumnsin a relational table.
Example Usage:
For anEmployee entity, attributes might include:

CREATE TABLE Employees (
EmployeeID INT PRIMARY KEY,
Name VARCHAR(50),
Salary DECIMAL(10,2),
DepartmentID INT
);
* Eachattribute(e.g., Name, Salary) becomes acolumnin the table.
Why Other Options Are Incorrect:
* Option A (Modality) (Incorrect):Describesoptional vs. mandatoryrelationships, not table structure.
* Option B (Uniqueness) (Incorrect):Ensuresdistinct valuesbutis not a column property.
* Option D (Non-null values) (Incorrect):Ensures thatcolumns must contain databut doesnot define attributes.
Thus, the correct answer isAttribute, as attributes of entities becometable columns.


NEW QUESTION # 40
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