WGU C175 Final Exam Solution guide_2022-2023 Already
solved
Flat Files - ANSWER a file having no internal hierarchy
Hashed Files - ANSWER A file that has been encrypted for security purposes.
Heap File - ANSWER An unsorted set of records.
Information - ANSWER The transformation of raw data into useful facts.
Punch Card - ANSWER A card that is perforated and can hold commands or data.
Structured Data - ANSWER Information with a high degree of organization.
Unstructured Data - ANSWER Information that does not have structure (such as text)
Binary Relationship - ANSWER A relationship between two entity types.
Unary Relationship - ANSWER An associate occurrence of an entity type with other
occurrences of the same entity type.
Cardinality - ANSWER The maximum number of entities that can be involved in a
particular relationship.
E-R Model
*E-R = Entity - Relationship - ANSWER Diagram of entities together with their attributes
and the relationship among them.
Intersection Data - ANSWER It is data that describes a many-to-many relationship.
Modality - ANSWER It is a minimum number of entity occurrences that can be involved
in a relationship.
One-to-one Binary Relationship - ANSWER It means that a single occurrence of one
entity type can be associated with a single occurrence of the other entity type and vice
versa.
Ternary Relationship - ANSWER Involves three different entity types.
Unique identifier - ANSWER It is used to uniquely identify each record in a database
table.
, Attribute - ANSWER A property, characteristic, or fact that we know about an entity.
"A salesperson works in one office."
What is the name of this relationship? - ANSWER One-to-one binary relationship
"A salesperson sells to many customers."
What is the name of this relationship? - ANSWER One-to-many binary relationship
"A salesperson is authorized to sell many products, and a product can be sold by many
salespersons."
What is the name of this relationship? - ANSWER Many-to-many binary relationship
What is the positioning and meaning for Cardinality and Modality on an E-R model? -
ANSWER Cardinality is the outer symbol; represents the maximum.
Modality is the inner symbol; represents the minimum.
"A salesperson works in a minimum of one and a maximum of one office, and an office
may be occupied by or assigned to a minimum of zero and a maximum of one
salesperson." - ANSWER
"A salesperson may have no customers or many customers." - ANSWER
Describe the ER model for "Each salesperson is authorized to sell to at least one or
many products, and each product can be sold by at least one or many salespeople." -
ANSWER
"One salesperson backs-up another salesperson."
What is the name of this model? - ANSWER One-to-one unary relationship
"A salesperson manages zero to many other salespersons, and a salesperson is
managed by exactly one other salesperson."
What is the name of this model? - ANSWER One-to-many unary relationship
"A product can either be part of no other products or be part of several other products,
and a product can either be composed of no other products or be composed of several
other products."
What is the name of this model? - ANSWER Many-to-many unary relationship
solved
Flat Files - ANSWER a file having no internal hierarchy
Hashed Files - ANSWER A file that has been encrypted for security purposes.
Heap File - ANSWER An unsorted set of records.
Information - ANSWER The transformation of raw data into useful facts.
Punch Card - ANSWER A card that is perforated and can hold commands or data.
Structured Data - ANSWER Information with a high degree of organization.
Unstructured Data - ANSWER Information that does not have structure (such as text)
Binary Relationship - ANSWER A relationship between two entity types.
Unary Relationship - ANSWER An associate occurrence of an entity type with other
occurrences of the same entity type.
Cardinality - ANSWER The maximum number of entities that can be involved in a
particular relationship.
E-R Model
*E-R = Entity - Relationship - ANSWER Diagram of entities together with their attributes
and the relationship among them.
Intersection Data - ANSWER It is data that describes a many-to-many relationship.
Modality - ANSWER It is a minimum number of entity occurrences that can be involved
in a relationship.
One-to-one Binary Relationship - ANSWER It means that a single occurrence of one
entity type can be associated with a single occurrence of the other entity type and vice
versa.
Ternary Relationship - ANSWER Involves three different entity types.
Unique identifier - ANSWER It is used to uniquely identify each record in a database
table.
, Attribute - ANSWER A property, characteristic, or fact that we know about an entity.
"A salesperson works in one office."
What is the name of this relationship? - ANSWER One-to-one binary relationship
"A salesperson sells to many customers."
What is the name of this relationship? - ANSWER One-to-many binary relationship
"A salesperson is authorized to sell many products, and a product can be sold by many
salespersons."
What is the name of this relationship? - ANSWER Many-to-many binary relationship
What is the positioning and meaning for Cardinality and Modality on an E-R model? -
ANSWER Cardinality is the outer symbol; represents the maximum.
Modality is the inner symbol; represents the minimum.
"A salesperson works in a minimum of one and a maximum of one office, and an office
may be occupied by or assigned to a minimum of zero and a maximum of one
salesperson." - ANSWER
"A salesperson may have no customers or many customers." - ANSWER
Describe the ER model for "Each salesperson is authorized to sell to at least one or
many products, and each product can be sold by at least one or many salespeople." -
ANSWER
"One salesperson backs-up another salesperson."
What is the name of this model? - ANSWER One-to-one unary relationship
"A salesperson manages zero to many other salespersons, and a salesperson is
managed by exactly one other salesperson."
What is the name of this model? - ANSWER One-to-many unary relationship
"A product can either be part of no other products or be part of several other products,
and a product can either be composed of no other products or be composed of several
other products."
What is the name of this model? - ANSWER Many-to-many unary relationship
