MOST-POPULAR DATA-MANAGEMENT-FOUNDATIONS STUDY MATERIALS DEMONSTRATE THE MOST ACCURATE EXAM DUMPS - VALIDVCE

Most-popular Data-Management-Foundations Study materials demonstrate the most accurate Exam Dumps - ValidVCE

Most-popular Data-Management-Foundations Study materials demonstrate the most accurate Exam Dumps - ValidVCE

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Tags: Data-Management-Foundations Practice Exam Pdf, Data-Management-Foundations Reliable Test Test, Exam Data-Management-Foundations Objectives, Test Data-Management-Foundations Discount Voucher, Data-Management-Foundations Test Pass4sure

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WGU Data Management – Foundations Exam Sample Questions (Q25-Q30):

NEW QUESTION # 25
Which type of join selects all the rows from both the left and right table, regardless of match?

  • A. Inner Join
  • B. Full Join
  • C. Cross Join
  • D. Outer Join

Answer: B

Explanation:
AFull Join (FULL OUTER JOIN)selectsall records from both tables, filling in NULL values where there is no match. This ensures that no data is lost from either table.
Example Usage:
sql
SELECT Employees.Name, Departments.DepartmentName
FROM Employees
FULL OUTER JOIN Departments ON Employees.DeptID = Departments.ID;
* This query retrievesall employees and all departments, even if an employeehas no assigned departmentor a departmenthas no employees.
Types of Joins:
* FULL OUTER JOIN (Correct Answer)# Includesall rows from both tables, filling missing values with NULL.
* LEFT JOIN (Incorrect)# Includesall rows from the left tableandmatching rows from the right table.
* RIGHT JOIN (Incorrect)# Includesall rows from the right tableandmatching rows from the left table.
* CROSS JOIN (Incorrect)# Produces aCartesian product(each row from one table is combined with every row from another table).
Thus, the correct answer isFULL JOIN, whichensures that all rows from both tables appear in the result.


NEW QUESTION # 26
Which clause is used to specify the join columns when performing a join in MySQL?

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

Answer: D

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 # 27
Which clause from a SELECT statement immediately accompanies the SELECT clause in MySQL?

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

Answer: D

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 # 28
Which clause or statement in a CREATE statement ensures a certain range of data?

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

Answer: D

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 # 29
Which constraint propagates primary key changes to foreign keys?

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

Answer: C

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 # 30
......

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