DETAILED DATA-MANAGEMENT-FOUNDATIONS ANSWERS - DATA-MANAGEMENT-FOUNDATIONS LATEST CRAM MATERIALS

Detailed Data-Management-Foundations Answers - Data-Management-Foundations Latest Cram Materials

Detailed Data-Management-Foundations Answers - Data-Management-Foundations Latest Cram Materials

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Tags: Detailed Data-Management-Foundations Answers, Data-Management-Foundations Latest Cram Materials, Data-Management-Foundations Questions Pdf, Data-Management-Foundations New Braindumps Pdf, Data-Management-Foundations Practice Test Fee

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WGU Data Management – Foundations Exam Sample Questions (Q17-Q22):

NEW QUESTION # 17
Which description defines a data type?

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

Answer: D

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 # 18
Which term defines a column, or group of columns, that refers to a primary key in a different table?

  • A. Super key
  • B. Simple 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 # 19
Which database operation locates the needed table blocks?

  • A. Table scan
  • B. Index scan
  • C. Fan-out
  • D. Binary search

Answer: B

Explanation:
Anindex scanis a database operation thatquickly locates table blocksusing anindexrather than scanning the entire table. It significantly improves query performance.
Example Usage:
sql
SELECT * FROM Employees WHERE EmployeeID = 105;
* If EmployeeID isindexed, the database uses anindex scantoquickly find the record.
Why Other Options Are Incorrect:
* Option A (Binary search) (Incorrect):A searching algorithm, but not a database operation.
* Option B (Table scan) (Incorrect):Scans theentire table, which isslowerthan an index scan.
* Option C (Fan-out) (Incorrect):Refers tobranching in B-Treesbut doesnot locate table blocks directly.
Thus, the correct answer isIndex scan, as it efficiently locates table blocks.


NEW QUESTION # 20
Which phase of entity-relationship modeling refers to the maxima and minima of relationships and attributes?

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

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 # 21
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 # 22
......

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