DATA-MANAGEMENT-FOUNDATIONS EXAM LAB QUESTIONS, STUDY DATA-MANAGEMENT-FOUNDATIONS DUMPS

Data-Management-Foundations Exam Lab Questions, Study Data-Management-Foundations Dumps

Data-Management-Foundations Exam Lab Questions, Study Data-Management-Foundations Dumps

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Tags: Data-Management-Foundations Exam Lab Questions, Study Data-Management-Foundations Dumps, Data-Management-Foundations Latest Test Guide, Guide Data-Management-Foundations Torrent, Trustworthy Data-Management-Foundations Exam Content

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WGU Data Management – Foundations Exam Sample Questions (Q30-Q35):

NEW QUESTION # 30
Which type of join selects all the rows from both the left and right table, regardless of match?

  • A. Outer Join
  • B. Cross Join
  • C. Full Join
  • D. Inner Join

Answer: C

Explanation:
AFull Join (FULL OUTER JOIN)selectsall records from both tables, filling in NULL values where there is no match. This ensures that no data is lost from either table.
Example Usage:
sql
SELECT Employees.Name, Departments.DepartmentName
FROM Employees
FULL OUTER JOIN Departments ON Employees.DeptID = Departments.ID;
* This query retrievesall employees and all departments, even if an employeehas no assigned departmentor a departmenthas no employees.
Types of Joins:
* FULL OUTER JOIN (Correct Answer)# Includesall rows from both tables, filling missing values with NULL.
* LEFT JOIN (Incorrect)# Includesall rows from the left tableandmatching rows from the right table.
* RIGHT JOIN (Incorrect)# Includesall rows from the right tableandmatching rows from the left table.
* CROSS JOIN (Incorrect)# Produces aCartesian product(each row from one table is combined with every row from another table).
Thus, the correct answer isFULL JOIN, whichensures that all rows from both tables appear in the result.


NEW QUESTION # 31
What is information independence?

  • A. An ability to change database type
  • B. An ability to make changes to existing queries
  • C. An ability to change the organization of data
  • D. An ability to interchange databases

Answer: C

Explanation:
Information independencerefers to theseparation between data storage and data access. It allows a database'slogical structureto be modifiedwithout affecting existing applications.
Types of Information Independence:
* Logical Data Independence# Ability to change theconceptual schema(e.g., renaming columns, adding new attributes)without modifying applications.
* Physical Data Independence# Ability to change thephysical storage structure(e.g., indexing, partitioning)without affecting queries.
Example of Logical Data Independence:
* Anew columnis added to the Customers table, but existing queriesstill work without modification.
Example of Physical Data Independence:
* Data is moved to SSD storagefor performance improvement, but queriesrun the same way.
Why Other Options Are Incorrect:
* Option A (Incorrect):Changing thedatabase type(e.g., MySQL to PostgreSQL) isnotinformation independence.
* Option B (Incorrect):Making changes toqueriesis unrelated to database independence.
* Option C (Incorrect):Interchanging databases is related todata portability, notinformation independence.
Thus, the correct answer isD - An ability to change the organization of data, asinformation independence ensuresmodifications do not disrupt database operations.


NEW QUESTION # 32
How can a primary key constraint be added after the table is created?

  • A. By using an ALTER clause
  • B. By using the CREATE TABLE statement
  • C. By using an INSERT INTO clause
  • D. By using an UPDATE clause

Answer: A

Explanation:
Toadd a primary key constraint after table creation, we use theALTER TABLEstatement.
Example Usage:
sql
ALTER TABLE Employees
ADD CONSTRAINT PK_Employees PRIMARY KEY (EmpID);
* Thisaddsa primary key to the EmpID columnafter the table was created.
Why Other Options Are Incorrect:
* Option B (CREATE TABLE) (Incorrect):Used for defining constraintsduringtable creation, not after.
* Option C (UPDATE) (Incorrect):Modifiesrow values, not constraints.
* Option D (INSERT INTO) (Incorrect):Used toadd datato a table, not modify constraints.
Thus, the correct answer isALTER TABLE, as itmodifies table structure to add a primary key constraint.


NEW QUESTION # 33
How is the primary key indicated in a table?

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

Answer: B

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 # 34
Which term refers to a path from a top-level block to a bottom-level block?

  • A. Branch
  • B. Crow's foot
  • C. Fan-out
  • D. Sparse index

Answer: A

Explanation:
In database indexing, abranchrefers to thepath from the top-level block (root node) to a bottom-level block (leaf node)in aB-Tree or B+ Tree index structure.
Example Usage in Indexing:
* AB-Tree indexorganizes data hierarchically, withbranches leading to different parts of the tree.
* When searching for a record, thequery follows a branchfrom theroot node down to the correct leaf node.
Why Other Options Are Incorrect:
* Option A (Fan-out) (Incorrect):Refers tohow many children a node has, not the path.
* Option B (Crow's foot) (Incorrect):Anotation used in ER diagrams, not indexing.
* Option D (Sparse index) (Incorrect):A type of indexstoring only some entries, not the path itself.
Thus, the correct answer isBranch, as it defines thepath from top to bottom in a database index.


NEW QUESTION # 35
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