1
WGU C175/D426 DATA MANAGEMENT FOUNDATIONS
OA EXAM ACTUAL EXAM 2 LATEST VERSIONS 300
QUESTIONS AND CORRECT DETAILED ANSWERS WITH
RATIONALES (100% CORRECT AND VERIFIED
ANSWERS)LATEST 2023|ALREADY GRADED A+
, 2
What does modality refer to? How does it appear on ER diagram? - ANSWER-
Refers to the MINIMUM number of times an instance in one entity can be
associated with instance of another entity (minima)
Appears as a 0 or 1 on the relationship line, next to cardinality
What is an important aspect to referential integrity? - ANSWER- reference to data
in one relation is based on values in another relation
Stuvia.com - The Marketplace to Buy and Sell your Study Material
, 3
What is a broad definition of data? - ANSWER- Raw facts captured on printed or
digital media
What are data? - ANSWER- Facts that are collected and stored in a database
system
What is a determining characteristic of unstructured data? - ANSWER- It does not
follow a data model
What is true about flat files? - ANSWER- - They contain no internal hierarchical
organization
How were data retrieved before database management systems? - ANSWER-
Sequentially from simple files
What is an attribute or group of attributes that uniquely identify a tuple in a
relation? - ANSWER- Primary Key
What is necessary for a primary key in one relation of a database to match with its
corresponding foreign key in another relation of the same database? - ANSWER- A
domain of values
What uniquely identifies each entity in a collection of entities but is not the
primary key? - ANSWER- Alternate Key
What is the term for a set of columns in a table that can uniquely identify any
record in that table without referring to other data? - ANSWER- Candidate Key
What happens to the original data in database indexing? - ANSWER- It is copied
to the index
Why are indexes created in a physical database design? - ANSWER- To retrieve
data DIRECTLY using a pointer
Why is an index created on a database column? - ANSWER- To optimize data
retrievals
Define: Functional Dependency - ANSWER- Each value of a column relates to at
MOST one value of another column
, 4
Dependence of one column on another
WGU C175/D426 DATA MANAGEMENT FOUNDATIONS
OA EXAM ACTUAL EXAM 2 LATEST VERSIONS 300
QUESTIONS AND CORRECT DETAILED ANSWERS WITH
RATIONALES (100% CORRECT AND VERIFIED
ANSWERS)LATEST 2023|ALREADY GRADED A+
, 2
What does modality refer to? How does it appear on ER diagram? - ANSWER-
Refers to the MINIMUM number of times an instance in one entity can be
associated with instance of another entity (minima)
Appears as a 0 or 1 on the relationship line, next to cardinality
What is an important aspect to referential integrity? - ANSWER- reference to data
in one relation is based on values in another relation
Stuvia.com - The Marketplace to Buy and Sell your Study Material
, 3
What is a broad definition of data? - ANSWER- Raw facts captured on printed or
digital media
What are data? - ANSWER- Facts that are collected and stored in a database
system
What is a determining characteristic of unstructured data? - ANSWER- It does not
follow a data model
What is true about flat files? - ANSWER- - They contain no internal hierarchical
organization
How were data retrieved before database management systems? - ANSWER-
Sequentially from simple files
What is an attribute or group of attributes that uniquely identify a tuple in a
relation? - ANSWER- Primary Key
What is necessary for a primary key in one relation of a database to match with its
corresponding foreign key in another relation of the same database? - ANSWER- A
domain of values
What uniquely identifies each entity in a collection of entities but is not the
primary key? - ANSWER- Alternate Key
What is the term for a set of columns in a table that can uniquely identify any
record in that table without referring to other data? - ANSWER- Candidate Key
What happens to the original data in database indexing? - ANSWER- It is copied
to the index
Why are indexes created in a physical database design? - ANSWER- To retrieve
data DIRECTLY using a pointer
Why is an index created on a database column? - ANSWER- To optimize data
retrievals
Define: Functional Dependency - ANSWER- Each value of a column relates to at
MOST one value of another column
, 4
Dependence of one column on another
