WGU C175 Study Notecards With Questions and
Answers
Flat Files - answera file having no internal hierarchy
Hashed Files - answerA file that has been encrypted for security purposes.
Heap File - answerAn unsorted set of records.
Information - answerThe transformation of raw data into useful facts.
Punch Card - answerA card that is perforated and can hold commands or data.
Structured Data - answerInformation with a high degree of organization.
Unstructured Data - answerInformation that does not have structure (such as text)
Binary Relationship - answerA relationship between two entity types.
Unary Relationship - answerAn associate occurrence of an entity type with other occurrences of the
same entity type.
Cardinality - answerThe maximum number of entities that can be involved in a particular
relationship.
E-R Model
*E-R = Entity - Relationship - answerDiagram of entities together with their attributes and the
,relationship among them.
Intersection Data - answerIt is data that describes a many-to-many relationship.
Modality - answerIt is a minimum number of entity occurrences that can be involved in a
relationship.
One-to-one Binary Relationship - answerIt 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 - answerInvolves three different entity types.
Unique identifier - answerIt is used to uniquely identify each record in a database table.
Attribute - answerA property, characteristic, or fact that we know about an entity.
"A salesperson works in one office."
What is the name of this relationship? - answerOne-to-one binary relationship
"A salesperson sells to many customers."
What is the name of this relationship? - answerOne-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? - answerMany-to-many binary relationship
, What is the positioning and meaning for Cardinality and Modality on an E-R model? -
answerCardinality 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? - answerOne-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? - answerOne-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? - answerMany-to-many unary relationship
What does 'refer' in Referential Integrity imply? - answerThis revolves around the circumstance of
trying to refer to data in one relation in the database, based on values in another relation.
Answers
Flat Files - answera file having no internal hierarchy
Hashed Files - answerA file that has been encrypted for security purposes.
Heap File - answerAn unsorted set of records.
Information - answerThe transformation of raw data into useful facts.
Punch Card - answerA card that is perforated and can hold commands or data.
Structured Data - answerInformation with a high degree of organization.
Unstructured Data - answerInformation that does not have structure (such as text)
Binary Relationship - answerA relationship between two entity types.
Unary Relationship - answerAn associate occurrence of an entity type with other occurrences of the
same entity type.
Cardinality - answerThe maximum number of entities that can be involved in a particular
relationship.
E-R Model
*E-R = Entity - Relationship - answerDiagram of entities together with their attributes and the
,relationship among them.
Intersection Data - answerIt is data that describes a many-to-many relationship.
Modality - answerIt is a minimum number of entity occurrences that can be involved in a
relationship.
One-to-one Binary Relationship - answerIt 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 - answerInvolves three different entity types.
Unique identifier - answerIt is used to uniquely identify each record in a database table.
Attribute - answerA property, characteristic, or fact that we know about an entity.
"A salesperson works in one office."
What is the name of this relationship? - answerOne-to-one binary relationship
"A salesperson sells to many customers."
What is the name of this relationship? - answerOne-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? - answerMany-to-many binary relationship
, What is the positioning and meaning for Cardinality and Modality on an E-R model? -
answerCardinality 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? - answerOne-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? - answerOne-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? - answerMany-to-many unary relationship
What does 'refer' in Referential Integrity imply? - answerThis revolves around the circumstance of
trying to refer to data in one relation in the database, based on values in another relation.
