SPLENDID DATA-MANAGEMENT-FOUNDATIONS EXAM MATERIALS: WGU DATA MANAGEMENT–FOUNDATIONS EXAM PRESENT YOU A BRILLIANT TRAINING DUMP - 2PASS4SURE

Splendid Data-Management-Foundations Exam Materials: WGU Data Management–Foundations Exam Present You a brilliant Training Dump - 2Pass4sure

Splendid Data-Management-Foundations Exam Materials: WGU Data Management–Foundations Exam Present You a brilliant Training Dump - 2Pass4sure

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WGU Data Management – Foundations Exam Sample Questions (Q50-Q55):

NEW QUESTION # 50
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 # 51
Which phase of entity-relationship modeling refers to the maxima and minima of relationships and attributes?

  • A. Cardinality
  • B. Partition
  • C. Attribute minimum
  • D. Physical design

Answer: A

Explanation:
Cardinalitydefines theminimum and maximum number of occurrencesof one entity in relation to another.
Example Usage in an ER Model:
* One-to-Many (1:M): Acustomer can place multiple orders, but each order belongs to onlyone customer.
Customers (1) --- (M) Orders
* Cardinality notation:
(1,1) # One-to-One
(0,M) # Zero-to-Many
(1,M) # One-to-Many
Why Other Options Are Incorrect:
* Option B (Physical design) (Incorrect):Focuses onstorage and indexing, not relationships.
* Option C (Attribute minimum) (Incorrect):No such formal term in database modeling.
* Option D (Partition) (Incorrect):Refers todividing tables, not relationship constraints.
Thus, the correct answer isCardinality, as it definesmin/max constraints on relationships.


NEW QUESTION # 52
Which relationship exists between occurrences of the same entity types?

  • A. Modality
  • B. Unary
  • C. Binary
  • D. Cardinality

Answer: B

Explanation:
Aunary relationship(also known as arecursive relationship) occurs when an entityrelates to itself.
Example Usage:
* Employees and Managers:
sql
CREATE TABLE Employees (
EmpID INT PRIMARY KEY,
Name VARCHAR(50),
ManagerID INT,
FOREIGN KEY (ManagerID) REFERENCES Employees(EmpID)
);
* Here, ManagerIDreferences another Employee# aunary (self-referential) relationship.
Why Other Options Are Incorrect:
* Option A (Modality) (Incorrect):Describesoptional vs. mandatoryrelationships, not self-referencing.
* Option C (Cardinality) (Incorrect):Defines how many instances relate,not the type of relationship.
* Option D (Binary) (Incorrect):Binary relationships involvetwo different entities, not self-referencing.
Thus, the correct answer isUnary, as it describesrelationships within the same entity type.


NEW QUESTION # 53
How is the primary key indicated in a table?

  • A. By using bold typeface in the appropriate column
  • B. By using a diamond symbol inserted into the table
  • C. By using a formula in SQL
  • D. By using an SQL keyword

Answer: D

Explanation:
In SQL, aprimary key is explicitly defined using the PRIMARY KEY keywordwhen creating a table.
Example Usage:
sql
CREATE TABLE Products (
ProductID INT PRIMARY KEY,
Name VARCHAR(100),
Price DECIMAL(10,2)
);
* Here,PRIMARY KEY is the SQL keyword that designates ProductID as the primary key.
Why Other Options Are Incorrect:
* Option A (Formula in SQL) (Incorrect):SQLdoes not use formulas to define primary keys.
* Option C (Bold typeface) (Incorrect):SQL syntax does not rely on text formatting.
* Option D (Diamond symbol) (Incorrect):ER diagramsmight use symbols, but SQLdoes not use diamonds to indicate keys.
Thus, the correct answer isSQL keyword, as primary keys are explicitly defined using PRIMARY KEY.


NEW QUESTION # 54
Which clause or statement in a CREATE statement ensures a certain range of data?

  • A. SET
  • B. CHECK
  • C. WHERE
  • D. FROM

Answer: B

Explanation:
TheCHECKconstraint is used in SQL toenforce ruleson a column's values. It ensures that data inserted into a table meets specified conditions, such as range restrictions or logical rules.
Example Usage:
sql
CREATE TABLE Employees (
ID INT PRIMARY KEY,
Name VARCHAR(50),
Salary INT CHECK (Salary BETWEEN 30000 AND 150000)
);
* This constraint ensures thatsalary values fall between 30,000 and 150,000.
* If an INSERT or UPDATE statement tries to set Salary = 20000, itfailsbecause it does notmeet the CHECK condition.
Why Other Options Are Incorrect:
* Option B (FROM) (Incorrect):Used in SELECT statements, not for constraints.
* Option C (WHERE) (Incorrect):Filters rows in queries butdoes not enforce constraints.
* Option D (SET) (Incorrect):Used for updating records (UPDATE table_name SET column = value) butnot for defining constraints.
Thus,CHECK is the correct answer, as it ensures that column values remain within an expected range.


NEW QUESTION # 55
......

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