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WGU Data Management – Foundations Exam Sample Questions (Q18-Q23):

NEW QUESTION # 18
Which relationship or association exists between a supertype and its subtype entities?

A. Weak entity
B. IsA relationship
C. Strong entity
D. Associative entity

Answer: B

Explanation:
Indatabase modeling, the relationship between asupertype and its subtypesis called anIsA relationship.
Example Usage:
* AVehicle supertypemay haveCar and Truck subtypes.
Vehicle
### Car
### Truck
* InER diagrams, this is represented as:
Vehicle (Supertype)
|
### Car (Subtype)
### Truck (Subtype)
* SQL Table Implementation:
sql
CREATE TABLE Vehicle (
VehicleID INT PRIMARY KEY,
Make VARCHAR(50),
Model VARCHAR(50)
);
CREATE TABLE Car (
VehicleID INT PRIMARY KEY,
FOREIGN KEY (VehicleID) REFERENCES Vehicle(VehicleID),
EngineType VARCHAR(50)
);
CREATE TABLE Truck (
VehicleID INT PRIMARY KEY,
FOREIGN KEY (VehicleID) REFERENCES Vehicle(VehicleID),
CargoCapacity INT
);
* This structurepreserves the IsA relationshipbetween Vehicle (supertype) and Car/Truck (subtypes).
Why Other Options Are Incorrect:
* Option A (Strong entity) (Incorrect):Strong entitiesdo not rely on a supertype/subtype hierarchy.
* Option C (Associative entity) (Incorrect):Used toresolve many-to-many relationships, not supertype
/subtype relationships.
* Option D (Weak entity) (Incorrect):Weak entitiesdepend on a strong entity, but supertype-subtype relations useinheritance(not dependency).
Thus, the correct answer isIsA relationship, as it describes theinheritance hierarchybetweensupertypes and subtypes.

NEW QUESTION # 19
Which keyword can be used as a clause in an ALTER TABLE statement?

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

Answer: B

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 # 20
Which SELECT statement uses valid syntax for SQL?

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

Answer: C

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 # 21
Which keyword combines INSERTS, UPDATES, and DELETES operations into a single statement?

A. JOIN
B. MERGE
C. INTO
D. DROP

Answer: B

Explanation:
TheMERGEstatement, also known asUPSERT, combinesINSERT, UPDATE, and DELETEoperations into asingle statementbased on a given condition. It is commonly used indata warehouses and large-scale databases.
Example Usage:
sql
MERGE INTO Employees AS Target
USING NewEmployees AS Source
ON Target.ID = Source.ID
WHEN MATCHED THEN
UPDATE SET Target.Salary = Source.Salary
WHEN NOT MATCHED THEN
INSERT (ID, Name, Salary) VALUES (Source.ID, Source.Name, Source.Salary);
* If a match is found, the UPDATE clause modifies the existing record.
* If no match is found, the INSERT clause adds a new record.
Why Other Options Are Incorrect:
* Option A (INTO) (Incorrect):Used in INSERT INTO, butdoes not combine operations.
* Option B (JOIN) (Incorrect):Used to combine rows from multiple tables, butnot for merging data.
* Option D (DROP) (Incorrect):Deletes database objects liketables, views, and indexes, butdoes not merge data.
Thus, the correct answer isMERGE, as itcombines inserts, updates, and deletes into a single operation.

NEW QUESTION # 22
Which primary key values consist of a single field only?

A. Simple
B. Stable
C. Partition
D. Meaningless

Answer: A

Explanation:
Asimple primary keyconsists ofonly one columnthat uniquely identifies each row in a table.
Example Usage:
sql
CREATE TABLE Students (
StudentID INT PRIMARY KEY,
Name VARCHAR(50)
);
* StudentIDis asimple primary keybecause it consists of only one field.
Why Other Options Are Incorrect:
* Option B (Partition) (Incorrect):Refers topartitioned tables, which divide data for performance reasons butare not related to primary keys.
* Option C (Stable) (Incorrect):This is not a recognized term in database keys.
* Option D (Meaningless) (Incorrect):Primary keys are oftenmeaningless (e.g., auto-incremented IDs)
, but this isnot a term used to describe their structure.
Thus, the correct answer isSimple, as asingle-field primary keyis referred to as asimple primary key.

NEW QUESTION # 23
......

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