WGU C175 Study Notecards Questions & Expertly
Verified Answers, .
Terms in this set (123)
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 Diagram of entities together with their attributes and the
relationship among them.
*E-R = Entity - Relationship
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.
It means that a single occurrence of one entity type can
One-to-one Binary
be associated with a single occurrence of the other entity
Relationship 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 One-to-one binary relationship
relationship?
"A salesperson sells to One-to-many binary relationship
many customers."
What is the name of this
relationship?
"A salesperson is Many-to-many binary relationship
authorized to sell many
products, and a product
can be sold by many
salespersons."
What is the name of this
relationship?
What is the positioning
Cardinality is the outer symbol; represents the maximum.
and meaning for
Cardinality and Modality
Modality is the inner symbol; represents the minimum.
on an E-R model?
, "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."
"One salesperson backsup
another salesperson."
What is the name of this One-to-one unary relationship
model?
"A salesperson manages zero
to many other salespersons,
and a salesperson is
One-to-many unary relationship
managed by exactly one
other salesperson."
What is the name of this
model?
Verified Answers, .
Terms in this set (123)
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 Diagram of entities together with their attributes and the
relationship among them.
*E-R = Entity - Relationship
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.
It means that a single occurrence of one entity type can
One-to-one Binary
be associated with a single occurrence of the other entity
Relationship 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 One-to-one binary relationship
relationship?
"A salesperson sells to One-to-many binary relationship
many customers."
What is the name of this
relationship?
"A salesperson is Many-to-many binary relationship
authorized to sell many
products, and a product
can be sold by many
salespersons."
What is the name of this
relationship?
What is the positioning
Cardinality is the outer symbol; represents the maximum.
and meaning for
Cardinality and Modality
Modality is the inner symbol; represents the minimum.
on an E-R model?
, "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."
"One salesperson backsup
another salesperson."
What is the name of this One-to-one unary relationship
model?
"A salesperson manages zero
to many other salespersons,
and a salesperson is
One-to-many unary relationship
managed by exactly one
other salesperson."
What is the name of this
model?
