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WGU Data Management – Foundations Exam Sample Questions (Q29-Q34):

NEW QUESTION # 29
Which keyword can be used as a clause in an ALTER TABLE statement?

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

Answer: C

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 # 30
Which statement is associated with two separate entities?

A. Reflexive relationship
B. Attribute
C. Entity type
D. Relationship

Answer: D

Explanation:
Arelationshipin an ER model defineshow two separate entities interact.
Example Usage:
A screenshot of a computer AI-generated content may be incorrect.

CREATE TABLE Customers (
CustomerID INT PRIMARY KEY,
Name VARCHAR(50)
);
CREATE TABLE Orders (
OrderID INT PRIMARY KEY,
CustomerID INT,
FOREIGN KEY (CustomerID) REFERENCES Customers(CustomerID)
);
* Customers and Orders are separate entities, related via CustomerID.
Why Other Options Are Incorrect:
* Option A (Reflexive relationship) (Incorrect):Used forself-referencing entities, not two different entities.
* Option B (Entity type) (Incorrect):Defines aclass of objects, but does not establish relationships.
* Option D (Attribute) (Incorrect):Attributesdescribeentities but do not connect them.
Thus, the correct answer isRelationship, as it connectstwo separate entities.

NEW QUESTION # 31
Which SELECT statement uses valid syntax for SQL?

A. SELECT column1, column2 WHERE condition FROM table_name;
B. SELECT "column name", "column name" FROM "table name" WHERE "column name"
C. SELECT ALL column1, column2 FROM table_name;
D. SELECT column1, column2 FROM table_name;

Answer: D

Explanation:
Avalid SELECT statementin SQL follows this basic syntax:
sql
SELECT column1, column2
FROM table_name
WHERE condition;
The correct optionDfollows this syntaxcorrectly.
Why Other Options Are Incorrect:
* Option A (Incorrect):SQL does not usedouble quotes(") around column/table names unless explicitly required in some databases.
* Option B (Incorrect):The WHERE clausemust appear after the FROM clause.
* Option C (Incorrect):ALL isnota valid keyword in standard SQL queries.
Thus,Option Dfollows the correct SQL syntax.

NEW QUESTION # 32
How can a primary key constraint be added after the table is created?

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

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 # 33
What is a common error made while inserting an automatically incrementing primary key?

A. Designating multiple primary keys
B. Failing to set a numeric value in a newly inserted row
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 # 34
......

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Data-Management-Foundations Latest Braindumps Free | Data-Management-Foundations Dumps Collection

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WGU Data Management – Foundations Exam Sample Questions (Q29-Q34):

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