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WGU Data Management – Foundations Exam Sample Questions (Q47-Q52):

NEW QUESTION # 47
Which constraint propagates primary key changes to foreign keys?

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

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 # 48
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 # 49
What is the first step of the analysis phase for designing a database?

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

Answer: B

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 # 50
How can a primary key constraint be added after the table is created?

A. By using an ALTER clause
B. By using an INSERT INTO clause
C. By using an UPDATE clause
D. By using the CREATE TABLE statement

Answer: A

Explanation:
Toadd a primary key constraint after table creation, we use theALTER TABLEstatement.
Example Usage:
sql
ALTER TABLE Employees
ADD CONSTRAINT PK_Employees PRIMARY KEY (EmpID);
* Thisaddsa primary key to the EmpID columnafter the table was created.
Why Other Options Are Incorrect:
* Option B (CREATE TABLE) (Incorrect):Used for defining constraintsduringtable creation, not after.
* Option C (UPDATE) (Incorrect):Modifiesrow values, not constraints.
* Option D (INSERT INTO) (Incorrect):Used toadd datato a table, not modify constraints.
Thus, the correct answer isALTER TABLE, as itmodifies table structure to add a primary key constraint.

NEW QUESTION # 51
Which keyword can be used as a clause in an ALTER TABLE statement?

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

Answer: A

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 # 52
......

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