WGU C175 Final Exam Review Solution guide_2022
Flat Files
a file having no internal hierarchy
Hashed Files
A file that has been encrypted for security purposes.
Heap File
An unsorted set of records.
Information
The transformation of raw data into useful facts.
Punch Card
A card that is perforated and can hold commands or data.
Structured Data
Information with a high degree of organization.
Unstructured Data
Information that does not have structure (such as text)
Binary Relationship
A relationship between two entity types.
Unary Relationship
An associate occurrence of an entity type with other occurrences of the same entity
type.
Cardinality
The maximum number of entities that can be involved in a particular relationship.
E-R Model
*E-R = Entity - Relationship
Diagram of entities together with their attributes and the relationship among them.
Intersection Data
It is data that describes a many-to-many relationship.
Modality
It is a minimum number of entity occurrences that can be involved in a relationship.
One-to-one Binary Relationship
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
Involves three different entity types.
Unique identifier
It is used to uniquely identify each record in a database table.
Attribute
A property, characteristic, or fact that we know about an entity.
"A salesperson works in one office."
What is the name of this relationship?
One-to-one binary relationship
, "A salesperson sells to many customers."
What is the name of this relationship?
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?
Many-to-many binary relationship
What is the positioning and meaning for Cardinality and Modality on an E-R model?
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."
"A salesperson may have no customers or many customers."
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."
Flat Files
a file having no internal hierarchy
Hashed Files
A file that has been encrypted for security purposes.
Heap File
An unsorted set of records.
Information
The transformation of raw data into useful facts.
Punch Card
A card that is perforated and can hold commands or data.
Structured Data
Information with a high degree of organization.
Unstructured Data
Information that does not have structure (such as text)
Binary Relationship
A relationship between two entity types.
Unary Relationship
An associate occurrence of an entity type with other occurrences of the same entity
type.
Cardinality
The maximum number of entities that can be involved in a particular relationship.
E-R Model
*E-R = Entity - Relationship
Diagram of entities together with their attributes and the relationship among them.
Intersection Data
It is data that describes a many-to-many relationship.
Modality
It is a minimum number of entity occurrences that can be involved in a relationship.
One-to-one Binary Relationship
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
Involves three different entity types.
Unique identifier
It is used to uniquely identify each record in a database table.
Attribute
A property, characteristic, or fact that we know about an entity.
"A salesperson works in one office."
What is the name of this relationship?
One-to-one binary relationship
, "A salesperson sells to many customers."
What is the name of this relationship?
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?
Many-to-many binary relationship
What is the positioning and meaning for Cardinality and Modality on an E-R model?
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."
"A salesperson may have no customers or many customers."
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."
