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Study WGU Data-Management-Foundations Reference, New Data-Management-Foundations Test Pdf

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WGU Data Management – Foundations Exam Sample Questions (Q11-Q16):

NEW QUESTION # 11
Which description defines a data type?

A. It is an unnamed tuple of values.
B. It has a name and a varying set of rows.
C. It is a named set of values.
D. It has values corresponding to columns.

Answer: C

Explanation:
Adata typedefines the kind of data a column can store in a database. It ensures data consistency and efficient storage.
* Option A (Correct):A data type is anamed set of values, such asINTEGER, VARCHAR, DATE, etc.
* Option B (Incorrect):A tuple refers to arowin a relational database, not a data type.
* Option C (Incorrect):Data typesdefinecolumn values, but they do not correspond directly to columns.
* Option D (Incorrect):Data types do not have avaryingset of rows; they define attributes for columns.

NEW QUESTION # 12
Which primary key values consist of a single field only?

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

Answer: C

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 # 13
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 # 14
Which function measures a numeric value's distance from 0?

A. LOWER
B. CONCAT
C. FROM
D. ABS

Answer: D

Explanation:
TheABS()function in SQL returns theabsolute valueof a given number, effectively measuring itsdistance from zero.
Example Usage:
sql
SELECT ABS(-50), ABS(50);
Result:
50 | 50
* This function ensures that numbers arealways positive, regardless of their original sign.
Why Other Options Are Incorrect:
* Option A (CONCAT) (Incorrect):Used tocombine strings(not numbers).
* Option B (LOWER) (Incorrect):Converts text tolowercase, not numerical operations.
* Option C (FROM) (Incorrect):Part of SELECT FROM queries,not a function.
Thus, the correct choice isABS(), which computes the absolute value of a number.

NEW QUESTION # 15
What is the role of the database administrator?

A. The database administrator is a consumer of data in a database.
B. The database administrator determines the format of each data element and the overall database structure.
C. The database administrator develops computer programs that utilize a database.
D. The database administrator is responsible for securing the database system against unauthorized users.

Answer: D

Explanation:
ADatabase Administrator (DBA)is responsible for the management, security, and performance of a database system. This includes controlling access to data, ensuring database integrity, optimizing performance, managing backups, and protecting the system from unauthorized access.
* Option A (Incorrect):A DBA is not just a consumer of data but is primarily responsible for the database's management.
* Option B (Correct):Security is one of the key responsibilities of a DBA, including enforcing user access controls and implementing encryption and authentication mechanisms.
* Option C (Incorrect):While DBAs work with data structures, it is typically the role of adata architect ordatabase designerto define data formats and schema structures.
* Option D (Incorrect):Developing application programs that interact with the database is typically the role ofsoftware developersordatabase programmers, not DBAs.

NEW QUESTION # 16
......

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