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WGU Data Management – Foundations Exam Sample Questions (Q36-Q41):
NEW QUESTION # 36
Which statement is associated with two separate entities?
- A. Reflexive relationship
- B. Relationship
- C. Entity type
- D. Attribute
Answer: B
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 # 37
Which keyword can be used to combine two results into one table?
- A. MERGE
- B. CONSOLIDATE
- C. UNION
- D. INTEGRATE
Answer: C
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 # 38
Which term defines a column, or group of columns, that refers to a primary key in a different table?
- A. Simple key
- B. Super key
- C. Foreign key
- D. Composite key
Answer: C
Explanation:
Aforeign keyis a column (or a set of columns) that establishes arelationship between two tablesby referencing theprimary key of another 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)
);
* DeptID in Employees is a foreign key, referencing DeptID in Departments.
* Ensuresreferential integrity# DeptID in Employeesmust existin Departments.
Why Other Options Are Incorrect:
* Option A (Super key) (Incorrect):Asuper keyis any set of columns that uniquely identifies a row, but itdoes not reference another table.
* Option B (Simple key) (Incorrect):Asimple keyis asingle-column primary key, not a reference to another table.
* Option C (Composite key) (Incorrect):Acomposite keyconsists ofmultiple columnsbut does not necessarily reference another table.
Thus, the correct answer isForeign key, as it establishes aconnection between two tables.
NEW QUESTION # 39
Which type of entity only exists in a logical sense?
- A. Intangible entity
- B. Physical entity
- C. Concrete entity
- D. Tangible entity
Answer: A
Explanation:
Anintangible entityis an entity that does not have a physical presence but still holds meaning in a database.
These entities representconcepts, relationships, or abstract datathat exist in a logical sense.
Example Usage in Databases:
* Customer Loyalty Status (Gold, Silver, Bronze)
* Theloyalty levelis anintangible entitysince it is derived from other data (purchase history).
* Online User Sessions
* Asession IDexistslogically in the systembut does not have a tangible presence like a product or employee.
Why Other Options Are Incorrect:
* Option A (Concrete entity) (Incorrect):No such formal term in database design.
* Option B (Tangible entity) (Incorrect):Represents somethingphysical, like anemployeeorproduct.
* Option D (Physical entity) (Incorrect):Refers todata stored on disk, like database tables or indexes.
Thus, the correct answer isIntangible entity, as it only exists in a logical sense within the database.
NEW QUESTION # 40
Where does a primary key traditionally appear in a table?
- A. In the top row
- B. In the first column
- C. In the last visible column
- D. In the table header
Answer: B
Explanation:
Bydatabase design conventions, theprimary key is usually placed in the first columnof a table to make it easy to identify and reference.
Example Usage:
sql
CREATE TABLE Employees (
EmpID INT PRIMARY KEY, -- First column (convention)
Name VARCHAR(50),
Salary DECIMAL(10,2)
);
* EmpID is placed as the first columnfor clarity and quick access.
Why Other Options Are Incorrect:
* Option A (In the table header) (Incorrect):Table headers onlydisplay column names, they do not contain values.
* Option C (In the top row) (Incorrect):Thetop row contains data, not theprimary key definition.
* Option D (In the last visible column) (Incorrect):While technically possible,placing a primary key at the endisuncommonin database design.
Thus, the correct answer isIn the first column, as this is the standard convention in relational databases.
NEW QUESTION # 41
......
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