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WGU Data Management – Foundations Exam Sample Questions (Q22-Q27):

NEW QUESTION # 22
Which keyword can be used to combine two results into one table?

A. INTEGRATE
B. CONSOLIDATE
C. MERGE
D. UNION

Answer: D

Explanation:
TheUNIONkeyword in SQL is used tocombine the resultsof two or more SELECT queries into asingle result setwhile removing duplicate rows.
Example:
sql
SELECT Name FROM Employees
UNION
SELECT Name FROM Managers;
* Option A (Correct):UNION combines results from multiple queries into one set,removing duplicates.
* Option B (Incorrect):MERGE is not a valid SQL keyword for combining result sets (it is used insome database systems for data merging).
* Option C (Incorrect):INTEGRATE is not a SQL keyword.
* Option D (Incorrect):CONSOLIDATE is not an SQL keyword.

NEW QUESTION # 23
Which constraint propagates primary key changes to foreign keys?

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

Answer: A

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 # 24
Which phase of entity-relationship modeling refers to the maxima and minima of relationships and attributes?

A. Partition
B. Physical design
C. Cardinality
D. Attribute minimum

Answer: C

Explanation:
Cardinalitydefines theminimum and maximum number of occurrencesof one entity in relation to another.
Example Usage in an ER Model:
* One-to-Many (1:M): Acustomer can place multiple orders, but each order belongs to onlyone customer.
Customers (1) --- (M) Orders
* Cardinality notation:
(1,1) # One-to-One
(0,M) # Zero-to-Many
(1,M) # One-to-Many
Why Other Options Are Incorrect:
* Option B (Physical design) (Incorrect):Focuses onstorage and indexing, not relationships.
* Option C (Attribute minimum) (Incorrect):No such formal term in database modeling.
* Option D (Partition) (Incorrect):Refers todividing tables, not relationship constraints.
Thus, the correct answer isCardinality, as it definesmin/max constraints on relationships.

NEW QUESTION # 25
Which relationship is shown in the following diagram?

A. Associative entity
B. Unary relationship
C. Many-to-many
D. Intersection data

Answer: B

Explanation:
The given diagram represents a unary relationship (also called a recursive relationship), which occurs when an entity is related to itself. In this case, salespersons back each other up, meaning a salesperson is associated with another salesperson from the same entity.
Key Observations from the Diagram:
* Single Entity (Salesperson)
* The table contains only one entity type, Salesperson, which has attributes such as Salesperson Number, Name, Commission, Percentage, and Year of Hire.
* Self-Referencing Relationship (Backs-up and Backed-up by)
* The diagram shows that a salesperson can back up another salesperson.
* This means that the relationship exists within the same entity rather than between two different entities.
* Cardinality (One-to-One Relationship in a Unary Form)
* The notation ( |-| ) in the ER diagram indicates a one-to-one recursive relationship.
* One salesperson can back up only one other salesperson, and each salesperson is backed up by only one.

NEW QUESTION # 26
Which statement uses valid syntax for the DELETE statement in SQL?

A. DELETE FROM table_name;
B. DELETE * FROM table_name WHERE condition;
C. DELETE table_name WHERE condition;
D. DELETE FROM table_name WHERE condition;

Answer: D

Explanation:
Thecorrect syntaxfor deleting records from a table in SQL is:
sql
DELETE FROM table_name WHERE condition;
This deletesonly the rowsthat match the condition.
Example Usage:
sql
DELETE FROM Employees WHERE Salary < 30000;
* Deletesall employees earning less than $30,000.
Why Other Options Are Incorrect:
* Option A (Incorrect):Missing FROMkeyword. The correct syntax is DELETE FROM table_name.
* Option C (Partially Correct):DELETE FROM table_name;deletes all rows, but it lacks a WHERE clause.
* Option D (Incorrect):DELETE *is not validin SQL. The correct command is just DELETE FROM.
Thus, the correct answer isDELETE FROM table_name WHERE condition;.

NEW QUESTION # 27
......

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WGU Data Management – Foundations Exam Sample Questions (Q22-Q27):

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