DATA-MANAGEMENT-FOUNDATIONS TRAINING ONLINE & DATA-MANAGEMENT-FOUNDATIONS LATEST MOCK EXAM

Data-Management-Foundations Training Online & Data-Management-Foundations Latest Mock Exam

Data-Management-Foundations Training Online & Data-Management-Foundations Latest Mock Exam

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Tags: Data-Management-Foundations Training Online, Data-Management-Foundations Latest Mock Exam, Valid Exam Data-Management-Foundations Blueprint, Reliable Data-Management-Foundations Braindumps Ppt, Trustworthy Data-Management-Foundations Exam Content

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Data-Management-Foundations Latest Mock Exam, Valid Exam Data-Management-Foundations Blueprint

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WGU Data Management – Foundations Exam Sample Questions (Q24-Q29):

NEW QUESTION # 24
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 # 25
Which keyword can be used as a clause in an ALTER TABLE statement?

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

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 # 26
Which term defines a column, or group of columns, that refers to a primary key in a different table?

  • A. Super key
  • B. Composite key
  • C. Foreign key
  • D. Simple 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 # 27
Which keyword is used to introduce a limiter in a SELECT statement?

  • A. FROM
  • B. WHERE
  • C. INTO
  • D. DROP

Answer: B

Explanation:
TheWHEREclause is used inSQL SELECT statementstolimitthe number of rows that match a specific condition. It helps filter data based on given criteria before retrieving the results.
Example Usage:
sql
SELECT *
FROM Employees
WHERE Salary > 50000;
* This querylimitsthe result set to employees whose salary isgreater than 50,000.
Why Other Options Are Incorrect:
* Option A (FROM) (Incorrect):Specifies the table from which data is retrieved butdoes not limit results.
* Option B (DROP) (Incorrect):Used fordeleting tables, databases, or views, not filtering rows.
* Option C (INTO) (Incorrect):Used in statements like INSERT INTO or SELECT INTO, whichdo not filter results.
Thus,WHERE is the correct keywordfor applying alimiter in a SELECT statement.


NEW QUESTION # 28
Which designation is an individual value, such as a salary?

  • A. Entity type
  • B. Relationship
  • C. Attribute type
  • D. Glossary

Answer: C

Explanation:
Anattribute typerefers to asingle, specific valuewithin a table, such as Salary, Age, or Price.
Example Usage:
A screenshot of a computer AI-generated content may be incorrect.

CREATE TABLE Employees (
EmpID INT PRIMARY KEY,
Name VARCHAR(50),
Salary DECIMAL(10,2)
);
* Salary is anattribute typewith individual values for each employee.
Why Other Options Are Incorrect:
* Option A (Glossary) (Incorrect):Refers todocumentation, not database values.
* Option B (Entity type) (Incorrect):Representsa class of objects(e.g., Employees), not individual values.
* Option D (Relationship) (Incorrect):Definesconnections between entities, not attributes.
Thus, the correct answer isAttribute type, as it represents anindividual data value.


NEW QUESTION # 29
......

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